Hi All.
Customers Audi A3 . Customer brought vehicle in for oil leak (rocker cover gasket) Cv boot and a couple of other non engine related issues.

Scanned for codes initially and noted the implausible fuel pressure code 16575.
Saved it, cleared and it did not return so we sent the vehicle out.

Customer got about 1./2 hour away and it developed a misfire.
Returned thinking we had got moisture in plug tube but in fact we had codes for misfire 1,3,4 Replaced worn plugs and failed #4 coil but noted on road test a misfire or surge at light throttle cruse.

Rechecked and found code for low fuel pressure sender- Low pressure short to positive (18974) and implausible code again. Checked group 103 and when codes are present pressure is at around 2000 mBar. With code cleared and running normally its 4900-5100 mBar although at one stage i did see a reading as high as 7000 mBar.

Intermittently it will go into a complete misfire across multiple systems- has done this twice and both time while parked up.

Pulled rear seat and scoped pump amp draw- 7-9 amps but when code triggers amp draw drops to 3-4 amps.
Checked voltage supply at pump- steady throughout. Went to check signal at sensor by back probing, but as soon as i back probed it the fault stopped occurring. previously i could get it to do it 2-3 times every road test.

I have been away for a few days and the guys have been moving the car in and out and it has recorded the implausible code again at some time, but will not do it again while testing it this morning.

Any ideas where to go next?



Code:
Wednesday,22,January,2020,13:00:22:20137
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 19.6.2.0 (x64)  HEX-V2 CB: 0.4508.4
Data version: 20190930 DS308.0
www.Ross-Tech.com


VIN: WAUZZZ8P54A096904   License Plate: GNY101
Mileage: 132490km-82325mi   Repair Order: 



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Chassis Type: 8P (1K0)
Scan: 01 02 03 08 09 15 16 17 19 25 42 44 46 47 52 55 56

VIN: WAUZZZ8P54A096904   Mileage: 132490km-82325miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: Cannot be reached 1100
-------------------------------------------------------------------------------
Address 01: Engine        Labels: None
   Part No SW: 06F 997 056 T    HW: Hardware No 
   Component: MED9.5.10        00 5751  
   Revision: 00000000    Serial number: AUX7Z0C9FNL0DI
   Coding: 0000075
   Shop #: WSC 06435 000 00000
   VCID: 44D14C63029F35B7ADF-8010

   Subsystem 1 - Part No: 06F 907 807 A
   Component: NOX  0310070157 004 3608
   06F907807A  NOX  0310070157 004 3608   

1 Fault Found:
18972 - Low Pressure Fuel Sensor (G410) 
            P2540 - 008 - Implausible Signal - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09G-927-750.clb
   Part No: 09G 927 750 C
   Component: AQ 250 6F           0428  
   Coding: 0000008
   Shop #: WSC 06435 000 00000
   VCID: 313F15B7AD2DB01F769-8064

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1K0-907-379-MK60-F.lbl
   Part No: 1K0 907 379 D
   Component: ESP FRONT MK60      0102  
   Coding: 0053894
   Shop #: WSC 06435 000 00000
   VCID: 33331FBF5731820F045-8066

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8P0-820-043.lbl
   Part No SW: 8P0 820 043 D    HW: 8P0 820 043 D
   Component: KlimavollautomatH12 0150  
   Revision: 005659      Serial number: 8P0820043D    
   Shop #: WSC 00000 000 00000
   VCID: 2D0709C7B115D4FF521-8078

2 Faults Found:
00797 - Sunlight Photo Sensor (G107) 
            009 - Open or Short to Ground - Intermittent
             Freeze Frame:
                    Fault Status: 00101001
                    Fault Priority: 3
                    Fault Frequency: 111
                    Reset counter: 102
                    Mileage: 126887 km
                    Time Indication: 0
                    Date: 2019.05.07
                    Time: 11:54:49

             Freeze Frame:

01274 - Air Flow Flap Positioning Motor (V71) 
            003 - Mechanical Failure - Intermittent
             Freeze Frame:
                    Fault Status: 00100011
                    Fault Priority: 3
                    Fault Frequency: 2
                    Reset counter: 72
                    Mileage: 131317 km
                    Time Indication: 0
                    Date: 2019.10.12
                    Time: 10:09:19

             Freeze Frame:
                    Voltage: 14.10 V
                    Temperature: 16.5°C
                    (no units): 69.0
                    (no units): 30.0
                    Temperature: 13.0°C


-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels:. 8P0-907-279-23-H.lbl
   Part No SW: 8P0 907 279 A    HW: 8P0 907 279 A*
   Component: Bordnetz-SG 1.0 H29 0501  
   Revision: 00029000    Serial number: 00000000274382
   Coding: 038E4F00A0141000000000000000000000
   Shop #: WSC 00000 000 00000
   VCID: 3B23379F7F614A4FDC5-806E

   Subsystem 1 - Part No: 8P2 955 119   Labels: 1TX-955-119.CLB
   Component: Wischer WWS Audi350 0130  
   Coding: 16711696
   Shop #: WSC 00000  

1 Fault Found:
01049 - Supply Voltage Term 50 
            006 - Short to Plus - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8P0-959-655-84.lbl
   Part No SW: 8P0 959 655 F    HW: 8P0 959 655 F
   Component: Airbag 8.4ED    H01 0130  
   Coding: 0010603
   Shop #: WSC 06435 000 00000
   VCID: 45D7516709A50CBFBA1-8010

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 1K0-953-549-MY8.lbl
   Part No SW: 1K0 953 549     HW: 1K0 953 549 
   Component: Lenksäulenmodul 009 0030  
   Coding: 0010002
   Shop #: WSC 06435 000 00000
   VCID: 6FBBD3CF7B99E6EF20D-803A

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8P0-920-xxx-17-MY7.lbl
   Part No SW: 8P0 920 930 G    HW: 8P0 920 930 G
   Component: KOMBIINSTR. VDO H25 0080  
   Revision: D05         Serial number: 2246CD05001183
   Coding: 0002901
   Shop #: WSC 09998 002 1048576
   VCID: 363526AB4443972723B-8062

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 1K0-907-530-V1.clb
   Part No SW: 1K0 907 530 B    HW: 1K0 907 951 
   Component: Gateway         H08 0090  
   Revision: 08          Serial number: 240010390541F3
   Coding: 7F0F0342070101
   Shop #: WSC 06435 000 00000
   VCID: 2615F6EB94E3E7A793B-8072

1 Fault Found:
01304 - Radio 
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 2
                    Fault Frequency: 254
                    Reset counter: 63
                    Mileage: 132322 km
                    Time Indication: 0
                    Date: 2020.01.04
                    Time: 12:50:31


-------------------------------------------------------------------------------
Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
   Part No SW: 8P0 920 930 G    HW: 8P0 920 930 G
   Component: KOMBIINSTR. VDO H25 0080  
   Revision: D05         Serial number: AUX7Z0C9FNL0DI
   Shop #: WSC 09998 002 1048576
   VCID: 363526AB4443972723B-8062

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 8P0-959-801-MAX1.lbl
   Part No: 8P0 959 801 
   Component: Tuersteuerger.  H10 0010  
   Coding: 0000048
   Shop #: WSC 06435 000 00000
   VCID: 78A9E8930ED7A157F17-802C

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1Kx-909-144-G2V1.clb
   Part No: 1K2 909 144 E
   Component: EPS_ZFLS Kl.9       1202  
   Shop #: WSC 00000 000 00000
   VCID: 2E050ECBBC13AFE76BB-807A

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 8P0-959-433.lbl
   Part No: 8P0 959 433 A
   Component:    KSG          H02 0040  
   Coding: 008800186D288505485A016000
   Shop #: WSC 72800 981 95529
   VCID: 3A2D329B705B7347C73-806E

   Subsystem 1 - Component:   Sounder n.mounted     

   Subsystem 2 - Component:       NGS n.mounted     

   Subsystem 3 - Component:      IRUE n.mounted     

1 Fault Found:
00466 - Control Module for Steering Column Electronics (J527) 
            004 - No Signal/Communication - Intermittent

-------------------------------------------------------------------------------
Address 47: Sound System        Labels: 8Px-035-382.lbl
   Part No SW: 8P3 035 382     HW: 8P3 035 382 
   Component: AB2 SUBWOOFERBOXH23 0100  
   Revision: 00001       Serial number: 10000001083475
   Shop #: WSC 00000 000 00000
   VCID: 70B9D0B366A7F917397-8024

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels: 8P0-959-802-MAX1.lbl
   Part No: 8P0 959 802 
   Component: Tuersteuerger.  H10 0010  
   Coding: 0000048
   Shop #: WSC 06435 000 00000
   VCID: 79AFED9735DDB85F8E9-802C

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 8P0-907-357.lbl
   Part No: 8P0 907 357 A
   Component: Dynamische LWR  H01 0010  
   Revision: 00000000    Serial number:               
   Coding: 0000001
   Shop #: WSC 06435 000 00000
   VCID: 382928934E576157317-806C

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio
Cannot be reached

End----------(Elapsed Time: 00:58, VBatt start/end: 13.8V/13.9V)-----------

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                Address 01: Engine       Labels: None
Control Module Part Number: 06F 997 056 T    HW: Hardware No 
  Component and/or Version: MED9.5.10        00 5751
           Software Coding: 0000075
            Work Shop Code: WSC 06435 000 00000
           Additional Info: 06F907807A  NOX  0310070157 004 3608   
           Additional Info: Geraet 00000
                      VCID: 44D14C63029F35B7ADF-8010
1 Fault Found:

18972 - Low Pressure Fuel Sensor (G410) 
            P2540 - 008 - Implausible Signal - Intermittent

Readiness: 0000 0000

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--------------------------------------------------------------------------------


                Address 01: Engine       Labels: None
Control Module Part Number: 06F 997 056 T    HW: Hardware No 
  Component and/or Version: MED9.5.10        00 5751
           Software Coding: 0000075
            Work Shop Code: WSC 06435 000 00000
           Additional Info: 06F907807A  NOX  0310070157 004 3608   
           Additional Info: Geraet 00000
                      VCID: 44D14C63029F35B7ADF-8010
1 Fault Found:

18972 - Low Pressure Fuel Sensor (G410) 
            P2540 - 008 - Implausible Signal - Intermittent

Readiness: 0000 0000

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


                Address 01: Engine       Labels: None
Control Module Part Number: 06F 997 056 T    HW: Hardware No 
  Component and/or Version: MED9.5.10        00 5751
           Software Coding: 0000075
            Work Shop Code: WSC 06435 000 00000
           Additional Info: 06F907807A  NOX  0310070157 004 3608   
           Additional Info: Geraet 00000
                      VCID: 44D14C63029F35B7ADF-8010
1 Fault Found:

18972 - Low Pressure Fuel Sensor (G410) 
            P2540 - 008 - Implausible Signal - Intermittent

Readiness: 0000 0000

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Address 01: DTCs cleared
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                Address 01: Engine  (06F 997 056 T)

13:21:23 Group 103
  4998.0 mbar  Pressure 
  -23 mbar  Pressure 
  977 mbar  Pressure