P3088 Intermittent Electrical Fault with Starter Relay on B7 RS4

   #1  

RS4v8

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Sorry for taking a short cut and just going to the point with no logs. I have a starting issue with my RS4 that throws a P3088 code for the starter relay. It happens once or twice in twenty starts.

Just to get an opinion. Is it a safe bet to change the starter relays? What are the part numbers so I can order if I need to.
 
   #2  

RS4v8

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Hmm. I think taking short cuts isn't going to help. Let me post the logs so that the faults can be contextualized within the startup sequence.
 
   #3  

PetrolDave

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Does it always start if you press and hold the start button?

P.S. Yes please post the Auto-Scan.
 
   #4  

Bruce

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Repair information such as parts and so on can be found in the online erWin repair information - with limits. See the how to in the blue menu bar at the top of most every page in this forum for more information.

The Autoscan is your key to helping us help you. Without it we have no starting point for your particular car.
 
   #5  

RS4v8

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Does it always start if you press and hold the start button?

P.S. Yes please post the Auto-Scan.
Yes 99% of the time it starts perfectly. But there will be that 1% when it needs to crank for a few more seconds before it starts (press start, turnsover/cranks for longer than normal and then starts). And that's when it triggers an EPC - the P3088 code. It's not so easy to predict when the 1% will come. But it's sometimes when the outside temperature is a bit hot.
 
   #6  

RS4v8

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Repair information such as parts and so on can be found in the online erWin repair information - with limits. See the how to in the blue menu bar at the top of most every page in this forum for more information.

The Autoscan is your key to helping us help you. Without it we have no starting point for your particular car.
Thank you for your pointer. First time I hear about erWin. Let me learn more.

Autoscan outcome to follow soon.
 

RS4v8

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Code:
Monday,24,October,2022,15:57:01:17755
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 22.9.0.0 (x64)  HEX-V2 CB: 0.4623.4
Data version: 20220830 DS341.0
www.Ross-Tech.com


VIN: WUAZZZ8E47N900000   License Plate:


Chassis Type: 8E (8E - Audi A4/S4/RS4 B6/B7 (2001 > 2008))
Scan: 01 02 03 08 09 0F 11 15 16 17 18 25 36 37 45 46 55 56 57 65
          67 69 75 76 77
 
VIN: WUAZZZ8E47N900000   Mileage: 136630km-84897miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels:. 079-910-560-BNS1.lbl
   Part No SW: 8E1 910 560 B    HW: 8E1 907 560
   Component: 4.2L V8/4V FSI     ª0040 
   Revision: --H13---    Serial number:               
   Coding: 01040000180F0160
   Shop #: WSC 03163 996 87872
   VCID: 2516040569E55393B45-8070
   VINID: 9E546AAAA215107789003006003BAE43FF

12 Faults Found:
012312 - Valve for Exhaust Flap 1 (N321)
               P3018 - 002 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 11
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 167 /min
                    Load: 100.0 %
                    Speed: 0.0 km/h
                    Temperature: 15.0°C
                    Temperature: 22.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.033 V

001112 - Evap System Purge Control Valve (N80)
               P0458 - 002 - Short to Ground - MIL ON
             Freeze Frame:
                    Fault Status: 11100010
                    Fault Priority: 0
                    Fault Frequency: 11
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 149 /min
                    Load: 100.0 %
                    Speed: 0.0 km/h
                    Temperature: 15.0°C
                    Temperature: 18.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.033 V

008201 - Intake Manifold Flap; Bank 1
               P2009 - 002 - Short to Ground - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 10
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 149 /min
                    Load: 100.0 %
                    Speed: 0.0 km/h
                    Temperature: 15.0°C
                    Temperature: 18.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.033 V

004199 - Intake Air Switch-Over Valve (N335)
               P1067 - 002 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 11
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 167 /min
                    Load: 100.0 %
                    Speed: 0.0 km/h
                    Temperature: 15.0°C
                    Temperature: 22.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.033 V

005173 - Secondary Air Pump Relay (J299)
               P1435 - 002 - Short to Ground - MIL ON
             Freeze Frame:
                    Fault Status: 11100010
                    Fault Priority: 0
                    Fault Frequency: 11
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 168 /min
                    Load: 99.2 %
                    Speed: 0.0 km/h
                    Temperature: 21.0°C
                    Temperature: 27.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.033 V

005153 - Secondary Air Injection Solenoid Valve (N112)
               P1421 - 002 - Short to Ground - MIL ON
             Freeze Frame:
                    Fault Status: 11100010
                    Fault Priority: 0
                    Fault Frequency: 11
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 168 /min
                    Load: 99.2 %
                    Speed: 0.0 km/h
                    Temperature: 21.0°C
                    Temperature: 27.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.033 V

008853 - Fuel Pressure Regulator Valve (N276)
               P2295 - 002 - Short to Ground - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 14
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 175 /min
                    Load: 100.0 %
                    Speed: 0.0 km/h
                    Temperature: 18.0°C
                    Temperature: 24.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.033 V

000049 - Oxygen (Lambda) Sensor B1 S1: Heating Circuit
               P0031 - 002 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 10
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 1143 /min
                    Load: 48.6 %
                    Speed: 0.0 km/h
                    Temperature: 26.0°C
                    Temperature: 20.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 13.970 V

000055 - Oxygen (Lambda) Sensor B1 S2: Heating Circuit
               P0037 - 002 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 10
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 968 /min
                    Load: 26.7 %
                    Speed: 0.0 km/h
                    Temperature: 28.0°C
                    Temperature: 20.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 13.970 V

005494 - Right Engine Mount Solenoid Valve (N145)
               P1576 - 002 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 10
                    Reset counter: 255
                    Mileage: 136155 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 168 /min
                    Load: 89.8 %
                    Speed: 0.0 km/h
                    Temperature: 37.0°C
                    Temperature: 39.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.160 V

000135 - Fuel Rail/System Pressure
               P0087 - 002 - Too Low - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 28
                    Reset counter: 255
                    Mileage: 136173 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 1197 /min
                    Load: 45.1 %
                    Speed: 0.0 km/h
                    Temperature: 31.0°C
                    Temperature: 31.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 13.589 V

012424 - Starter Relay
               P3088 - 001 - Electrical Malfunction - Intermittent
             Freeze Frame:
                    Fault Status: 00100001
                    Fault Priority: 0
                    Fault Frequency: 5
                    Reset counter: 255
                    Mileage: 136416 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 0 /min
                    Load: 0.0 %
                    Speed: 0.0 km/h
                    Temperature: 7.0°C
                    Temperature: 14.0°C
                    Absolute Pres.: 840.0 mbar
                    Voltage: 10.668 V

Readiness: 0000 1000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8E0-910-517.clb
   Part No SW: 8E0 910 517 G    HW: 8E0 614 517 BD
   Component: ESP8 quattro    H06 0150 
   Revision: 00000000    Serial number: 00000000000000
   Coding: 0004533
   Shop #: WSC 06335 000 00000
   VCID: 2B02F23D0F0165E3621-807E

1 Fault Found:
00532 - Supply Voltage B+
            002 - Lower Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 30
                    Time Indication: 0

             Freeze Frame:
                    Hex Value: 0x00C0
                    Hex Value: 0x4006
                    Hex Value: 0x0003
                    Hex Value: 0x1685
                    Hex Value: 0x0001


-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8E0-820-043.lbl
   Part No: 8E0 820 043 BQ
   Component:   A4 Klimaautomat   2833 
   Coding: 00000
   Shop #: WSC 00000 
   VCID: 71BE2055E8BD4F3318D-513C

1 Fault Found:
00819 - High Pressure Sensor (G65)
            07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 8E0-907-279-8EC.lbl
   Part No: 8E0 907 279 N
   Component: int. Lastmodul  ECE 0907 
   Coding: 01041
   Shop #: WSC 06335 
   VCID: 3D26CC65E465FB53CC5-4B1E

No fault code found.

-------------------------------------------------------------------------------
Address 11: Engine II        Labels:. 079-910-560-BNS2.lbl
   Part No SW: 8E1 910 560 B    HW: 8E1 907 560
   Component: 4.2L V8/4V FSI     ª0040 
   Revision: --H13---    Serial number: XXXXXXXXXXXXXX
   Coding: 01040000180F0160
   Shop #: WSC 03163 996 87872
   VCID: 2516040569E55393B45-8070

4 Faults Found:
004764 - Fuel Pressure Regulator Valve; Bank 2 (N276)
               P129C - 002 - Short to Ground - Intermittent
             Freeze Frame:
                    Fault Status: 00100010
                    Fault Priority: 0
                    Fault Frequency: 13
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 173 /min
                    Load: 100.0 %
                    Speed: 0.0 km/h
                    Temperature: 15.0°C
                    Temperature: 18.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.033 V

000081 - Oxygen (Lambda) Sensor B2 S1: Heating Circuit
               P0051 - 002 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 10
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 1092 /min
                    Load: 49.8 %
                    Speed: 0.0 km/h
                    Temperature: 27.0°C
                    Temperature: 20.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 13.970 V

000087 - Oxygen (Lambda) Sensor B2 S2: Heating Circuit
               P0057 - 002 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 10
                    Reset counter: 255
                    Mileage: 136151 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 897 /min
                    Load: 28.6 %
                    Speed: 0.0 km/h
                    Temperature: 28.0°C
                    Temperature: 20.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 13.970 V

005490 - Left Engine Mount Solenoid Valve (N144)
               P1572 - 002 - Short to Ground
             Freeze Frame:
                    Fault Status: 01100010
                    Fault Priority: 0
                    Fault Frequency: 10
                    Reset counter: 255
                    Mileage: 136155 km
                    Time Indication: 0

             Freeze Frame:
                    RPM: 186 /min
                    Load: 89.8 %
                    Speed: 0.0 km/h
                    Temperature: 37.0°C
                    Temperature: 39.0°C
                    Absolute Pres.: 830.0 mbar
                    Voltage: 10.287 V


-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8E0-959-655-94.lbl
   Part No SW: 8E0 959 655 G    HW: 8E0 959 655 G
   Component:    Airbag 9.41  H12 3730 
   Revision: 91H12373    Serial number: 0036M0G3HAVM 
   Coding: 0430712
   Shop #: WSC 06335 000 00000
   VCID: 3B22C27DFF61F563F21-806E

   Subsystem 1 - Serial number: 6332DRB403E2CE25Z

   Subsystem 2 - Serial number: 6342DRB403D51224E

   Subsystem 3 - Serial number: 6352ARB4018BBE3C%

   Subsystem 4 - Serial number: 6362ARB4018BD57F0

   Subsystem 5 - Serial number: 63729RB401A3FFF0%

   Subsystem 6 - Serial number: 63829RB401A3F6A1U

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 8E0-953-549-T.lbl
   Part No: 8E0 953 549 T
   Component: Lenksáulenmodul     0301 
   Coding: 06021
   Shop #: WSC 06335 
   VCID: 44D0B981878F8A9B83B-4B1E

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8E0-920-9xx-8EC.clb
   Part No SW: 8E0 920 931 G    HW: 8E0 920 931 G
   Component: KOMBI+WFS 4     H14 0040 
   Revision: 0040        Serial number: 00000000000000
   Coding: 0023111
   Shop #: WSC 03163 996 13764
   VCID: 2C00F1210A1F62DB6BB-5184

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 8E0-920-9xx-8EC.clb
   Part No SW: 8E0 920 931 G    HW: 8E0 920 931 G
   Component: KOMBI+WFS 4     H14 0040 
   Revision: 0040        Serial number: 00000000000000
   Coding: 0023111
   Shop #: WSC 03163 996 13764
   VCID: 2C00F1210A1F62DB6BB-5184

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: 8E0-959-760.lbl
   Part No: 8E0 959 760 A
   Component: Sitzverstellung H01 0020 
   Coding: 00001
   Shop #: WSC 06335 
   VCID: 323CEF592D0B342B217-4B1E

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation        Labels: 8E0-035-192-RNSE.clb
   Part No SW: 8E0 035 192 K    HW: 8E0 035 192 K
   Component: RNS-E HIGH EU   H72 0500 
   Revision:      01S    Serial number: AUZBZ7F1182915
   Coding: 0301114
   Shop #: WSC 02195 785 00200
   VCID: 2C00F1210A2F62DB6BB-513C

4 Faults Found:
00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 5
                    Fault Frequency: 41
                    Reset counter: 77
                    Time Indication: 0
                    Date: 2019.05.04
                    Time: 14:31:43

             Freeze Frame:
                    Mileage: 655350 km
                    Count: 2310
                    Clock: 13:32

00878 - Connection to Speaker Front Left
            006 - Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00100110
                    Fault Priority: 5
                    Fault Frequency: 4
                    Reset counter: 77
                    Time Indication: 0
                    Date: 2019.05.06
                    Time: 12:58:39

00879 - Connection to Speaker Front Right
            006 - Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00100110
                    Fault Priority: 5
                    Fault Frequency: 3
                    Reset counter: 77
                    Time Indication: 0
                    Date: 2019.05.06
                    Time: 12:58:39

00879 - Connection to Speaker Front Right
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 5
                    Fault Frequency: 11
                    Reset counter: 77
                    Time Indication: 0
                    Date: 2019.05.06
                    Time: 05:36:24


-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 8E0-951-177.lbl
   Part No: 8E0 951 177
   Component: Innenraumueberw.   0804 
   Coding: 00001
   Shop #: WSC 00000 
   VCID: 6B82323DCA91A5E3221-50F4

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 8E0-959-433-MAX.clb
   Part No: 8E0 959 433 CH
   Component: Komfortgerát T3B    4135 
   Coding: 07918
   Shop #: WSC 03163 
   VCID: 79AE1875B0CD0773A0D-4B1E

   Subsystem 1 - Part No: 8E2959802E
   Component: Tõrsteuer.FS BRM 0706 

   Subsystem 2 - Part No: 8E2959801E
   Component: Tõrsteuer.BF BRM 0706 

   Subsystem 3 - Part No: 8E0959801E
   Component: Tõrsteuer.HL BRM 0606 

   Subsystem 4 - Part No: 8E0959802E
   Component: Tõrsteuer.HR BRM 0606 

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4F0-910-357.lbl
   Part No SW: 4F0 910 357 F    HW: 4F0 907 357 F
   Component: AFS 1           H01 0020 
   Revision: 00000001    Serial number:               
   Coding: 0000019
   Shop #: WSC 06335 000 00000
   VCID: 290E083505FD77F390D-807C

   Subsystem 1 - Part No: 8E0 941 329 A
   Component: AFS-Modul links H03 0010

   Subsystem 2 - Part No: 8E0 941 329 A
   Component: AFS-Modul rechtsH03 0010

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8E0-035-192-RNSE.clb
   Part No SW: 8E0 035 192 K    HW: 8E0 035 192 K
   Component: RNS-E HIGH EU   H72 0500 
   Revision:      01S    Serial number: AUZBZ7F1182915
   Coding: 0301114
   Shop #: WSC 02195 785 00200
   VCID: 2C00F1210A2F62DB6BB-513C

4 Faults Found:
00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 5
                    Fault Frequency: 41
                    Reset counter: 77
                    Time Indication: 0
                    Date: 2019.05.04
                    Time: 14:31:43

             Freeze Frame:
                    Mileage: 655350 km
                    Count: 2310
                    Clock: 13:32

00878 - Connection to Speaker Front Left
            006 - Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00100110
                    Fault Priority: 5
                    Fault Frequency: 4
                    Reset counter: 77
                    Time Indication: 0
                    Date: 2019.05.06
                    Time: 12:58:39

00879 - Connection to Speaker Front Right
            006 - Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00100110
                    Fault Priority: 5
                    Fault Frequency: 3
                    Reset counter: 77
                    Time Indication: 0
                    Date: 2019.05.06
                    Time: 12:58:39

00879 - Connection to Speaker Front Right
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 5
                    Fault Frequency: 11
                    Reset counter: 77
                    Time Indication: 0
                    Date: 2019.05.06
                    Time: 05:36:24


-------------------------------------------------------------------------------
Address 57: TV Tuner        Labels: 4D0-919-146.clb
   Part No SW: 4D0 919 146 D    HW: 4D0 919 146 D
   Component: TV Tuner        H040580 
   Revision: 01H04001    Serial number: 00000000015330
   Coding: 0007130
   Shop #: WSC 06335 000 00000
   VCID: 2A0CF73900DB7CEB997-513C

No Faults Found
  or DTCs not supported by controller
  or a communication error occurred

-------------------------------------------------------------------------------
Address 65: Tire Pressure        Labels: 8E0-907-273.lbl
   Part No SW: 8E0 907 273 A    HW: 8E0 907 273 A
   Component: Reifendruck 3   H04 0130 
   Coding: 0022523
   Shop #: WSC 02197 785 00200
   VCID: 2A0CF73900DB7CEB997-513C

1 Fault Found:
02214 - Tire Pressure Warning
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 4
                    Fault Frequency: 10
                    Reset counter: 23
                    Time Indication: 0

             Freeze Frame:
                    (no units): 34.0
                    Temperature: 6.0°C
                    Error Code: 2048
                        Not Recogn.
                        Not Recogn.
                        Not Recogn.
                        Not Recogn.
                    RPM: 0 /min


-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 8E0-919-283-8EC.lbl
   Part No SW: 8E0 919 283 E    HW: 8E0 919 283 E
   Component: Parkhilfe 8-Kan H06 0010 
   Revision: 00H06000    Serial number: 00067802120624
   Coding: 0000104
   Shop #: WSC 06335 000 00000
   VCID: 323CEF59280B342B217-5160

No fault code found.

End----(Elapsed Time: 04:13, VBatt start/end: 11.4V/11.2V. VIgn 11.2V)-----
 
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Reactions: Uwe

Uwe

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There are many faults for actuators on that engine with "Short to GND" DTCs in those ECUs. This commonly occurs on low-side switched actuators when +12V is missing from the other side. I'm pretty confident you've got some voltage supply issue in this car and I doubt the problem is the starter relay itself.

-Uwe-
 

RS4v8

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There are many faults for actuators on that engine with "Short to GND" DTCs in those ECUs. This commonly occurs on low-side switched actuators when +12V is missing from the other side. I'm pretty confident you've got some voltage supply issue in this car and I doubt the problem is the starter relay itself.

-Uwe-
Thanks @Uwe. I guess this can also extend to the faults that the J299 secondary air pump relay issues? What would be the first route to remedy the voltage supply issue? VCDS had pointed out the low battery voltage issue in 2019 after the battery died and I struggled to even close my window (I had to call AA to help with their booster pack). So I bought a new battery which helped with the battery problem. But the DTCs keep coming back. Trying to think of a test approach.

The problems are also causing me drivability issues. I also see the car is running rich when I look at the fuel trim values.
 

RS4v8

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Thanks @Uwe. I guess this can also extend to the faults that the J299 secondary air pump relay issues? What would be the first route to remedy the voltage supply issue? VCDS had pointed out the low battery voltage issue in 2019 after the battery died and I struggled to even close my window (I had to call AA to help with their booster pack). So I bought a new battery which helped with the battery problem. But the DTCs keep coming back. Trying to think of a test approach.

The problems are also causing me drivability issues. I also see the car is running rich when I look at the fuel trim values.
Or even better do you have any references in South Africa who have dealt with these issues?
 

Uwe

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What would be the first route to remedy the voltage supply issue?
Get a wiring diagram for your specific car. Trace back from the far side of the actuators in question. When you find a place that they all get +12V from, that's the likely culprit.

-Uwe-
 
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