Q7 00139 - Left Front Body Acceleration Sensor (G341) Fault - How To Test Sensor?

   #1  

JonnyBhoy

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Hi,


The fault I want to diagnose and repair relates to the air suspension. A light comes on on the dash, warning me there is an issue with the system. The thing is, the air suspension seems to be working just fine, it rises up and down with no problem, even with this fault light coming on. And the fault seems to happen when I go over a bump. I can drive 40 miles on a smooth road and no fault light comes on, then I hit a pothole and the light comes on.

According to repeated VAG-COM tests, the issue is the Left Front Body Acceleration Sensor (G341). Each time the warning light comes on I use VagCOm to run a test then I reset the DTC codes. Next time I check the fault it's the same thing begin reported - Left Front Body Acceleration Sensor (G341)

How/where do I run a test on the Left Front Body Acceleration Sensor (G341)? I can see within the Level COntrol system there are tests I can run, but they are for things like the height of each corner, the pressure valves etc, but I see nothing for Left Front Body Acceleration Sensor (G341).

Also, would you suggest just buying a new Left Front Body Acceleration Sensor (G341) and swapping it out? According to Erwin it looks like a fairly easy swap, remove the front wheel liner then easy access to the sensor.

Here's a test I ran earlier this week showing the fault:

Code:
Monday,12,July,2021,16:11:18:61536
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.3.0.0 (x64)
Data version: 20210226 DS325.0
www.Ross-Tech.com


VIN: WAUZZZ4L5CD008563   
Mileage: 197430km-122677mi   Repair Order: LEVEL FAULT


Chassis Type: 4L-AU56 (4F0)
Scan: 01 02 03 05 08 09 15 16 17 18 19 34 3D 42 46 4F 52 55 56 5F
          62 69 6C 6D 6F 72 76

VIN: WAUZZZ4L5CD008563   Mileage: 197430km-122677miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
18-Aux. Heat -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
34-Level Control -- Status: Malfunction 0010
3D-Special Function -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
5F-Information Electr. -- Status: Malfunction 0010
62-Door, Rear Left -- Status: OK 0000
69-Trailer -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
6D-Trunk Elect. -- Status: OK 0000
6F-Centr. Conv. II -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine (J623-CRCA)       Labels:. 059-907-401-V2.clb
   Part No SW: 4L2 910 401 B    HW: 4L0 907 401 C
   Component: 3.0TDI EDC17  H37 0001
   Revision: 53H37---    Serial number:            
   Coding: 2A2A4012A52701020000
   Shop #: WSC 31414 790 00001
   ASAM Dataset: EV_ECM30TDI0114L2910401B 001001
   ROD: EV_ECM30TDI0114L1910401H.rod
   VCID: 234460242A259893FE-8076

No fault code found.
Readiness: 0 0 0 0 0

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels:| 0C8-927-750.clb
   Part No SW: 0C8 927 750 AL    HW: 0C8 927 750 AL
   Component: AL1000 AISIN  001 1977
   Serial number:            
   Coding: 001578
   Shop #: WSC 41538 001 1048576
   ASAM Dataset: EV_TCMAL991031 001001
   ROD: EV_TCMAL991031_001_AU56.rod
   VCID: 76E26970C9375D3BE9-8022

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels:. 4L0-910-517-V2.clb
   Part No SW: 4L0 910 517 M    HW: 4L0 614 517 L
   Component: ESP ALLRAD MK25E1   0020
   Revision: 00H02001  
   Coding: 2200673
   Shop #: WSC 12345 123 12345
   VCID: 3466937857CB0F2B17-8060

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth.        Labels:. 4F0-910-852.clb
   Part No SW: 4F0 910 852 B    HW: 4F0 905 852 F
   Component: FBSAUDIC6 ELV   H05 0130
   Revision: 00H05000    Serial number: 10603401872089
   Coding: 0000211
   Shop #: WSC 51245 002 1048576
   VCID: 25407E3CEC1166A390-8070

   Subsystem 1 - Part No: 4F0 910 132 E
   Component: FBSAUDIC6 EZS   H03 0020

   Subsystem 2 - Part No: 4F0 910 220 D
   Component: FBSAUDIC6 IDG   H01 0054

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels: None
   Part No SW: 4L0 910 043 D    HW: 4L0 820 043 AH
   Component: KLIMA 4 ZONEN H15 0070
   Revision: 00---026    Serial number: 00000030204553
   Coding: 01009416
   Shop #: WSC 31414 790 00001
   VCID: 25407E3C2C1166A390-8070

1 Fault Found:
01592 - Air Quality Sensor (G238)
            014 - Defective - Intermittent
             Freeze Frame:
                    Fault Status: 00101110
                    Fault Priority: 3
                    Fault Frequency: 15
                    Reset counter: 61
                    Mileage: 196958 km
                    Time Indication: 0
                    Date: 2021.06.30
                    Time: 13:01:02

             Freeze Frame:
                    Temperature: 26.0°C


-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 4F0-910-279.lbl
   Part No SW: 4F0 910 279 AH    HW: 4F0 907 279 D
   Component: ILM Fahrer      H31 0400
   Revision: 00000000    Serial number: 4F0907279  
   Coding: 0033121
   Shop #: WSC 31414 790 00001
   VCID: 6FEC5C147E6D6CF32A-803A

   Subsystem 1 - Part No: 4L2 910 113   Labels: 1KX-955-119.CLB
   Component: Wischer AU716   H13 0110
   Coding: 00064792
   Shop #: WSC 31414

   Subsystem 2 - Part No: 8K0 910 557   Labels: 8K0-955-559.CLB
   Component: REGENLICHTSENSORH04 0003
   Coding: 00150059
   Shop #: WSC 31414

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4L0-910-655.lbl
   Part No SW: 4L0 910 655 D    HW: 4L0 959 655 C
   Component: 71 AIRBAG AUDI8RH43 0230
   Revision: 04H43000    Serial number: 00399D085YHC
   Coding: 0014129
   Shop #: WSC 31414 790 00001
   VCID: 2E528110B9E725FB61-807A

   Subsystem 1 - Serial number: 6332QSME5B4F4D50W

   Subsystem 2 - Serial number: 6342QSME645C3854N

   Subsystem 3 - Serial number: 6352QSME3A5A2D7E+

   Subsystem 4 - Serial number: 6362QSME3C5A0A7C.

   Subsystem 5 - Serial number: 63734SME4F5A456CJ

   Subsystem 6 - Serial number: 63834SME5C4F00487

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 4F0-910-549.lbl
   Part No SW: 4F0 910 549 B    HW: 4F0 953 549 E
   Component: J0527               0830
   Revision: 00H07000    Serial number: 90026111600276
   Coding: 0102142
   Shop #: WSC 31414 790 00001
   VCID: 285E77089B037BCBAB-807C

   Subsystem 1 - Part No: XXXXXXXXXXX
   Component: E0221           H03 0030

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:. 4L0-920-xxx-17.clb
   Part No SW: 4L0 920 984 P    HW: 4L0 920 984 P
   Component: KOMBIINSTR.   H22 0410
   Revision: 00000000    Serial number: JX802V18C  
   Coding: 3356630400012600010404
   Shop #: WSC 31414 790 00001
   VCID: 408ECFA8D373A38B83-8014

No fault code found.

-------------------------------------------------------------------------------
Address 18: Aux. Heat        Labels: 4L0-910-105.lbl
   Part No SW: 4L0 910 105     HW: 4L0 815 071 G
   Component: Heizgeraet      H09 0140
   Revision: 0000000C    Serial number: 00000009021078
   Coding: 0000101
   Shop #: WSC 31414 790 00001
   VCID: 60CE2F28B3B3C38BA3-8034

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 4F0-907-468.clb
   Part No SW: 4F0 907 468 P    HW: 4F0 907 468 F
   Component: GW-BEM 4CAN-M H06 0047
   Revision: LB200032    Serial number: 3200L11719029C
   Coding: 00CF07
   Shop #: WSC 31414 790 00001
   VCID: 3C76BB58BF9BC76BDF-8068

   Subsystem 1 - Part No SW: 8K0 915 181 D    HW: 8K0 915 181 D
   Component: J367-BDM  H07 0125
   Serial number: 00000000002790984579

   Subsystem 2 - Part No SW: 8K0 959 663     HW: 8K0 959 663
   Component: J532_DCDCStab  H17 0042
   Serial number: 11216000003021200181

No fault code found.

-------------------------------------------------------------------------------
Address 34: Level Control        Labels: 4L0-910-553.lbl
   Part No SW: 4L0 910 553 H    HW: 4L0 907 553 E
   Component: LUFTFDR.-CDC    H04 7870
   Revision: --H04001    Serial number: 15.1528-0150.2
   Coding: 0015520
   Shop #: WSC 12345 123 12345
   VCID: 2F6C9C14BEED2CF36A-807A

2 Faults Found:
00139 - Left Front Body Acceleration Sensor (G341)
            008 - Implausible Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 3
                    Fault Frequency: 19
                    Reset counter: 61
                    Mileage: 196961 km
                    Time Indication: 0
                    Date: 2021.07.02
                    Time: 11:57:06

             Freeze Frame:
                    Error Code: 194

01577 - Turn-Off due to Over-Temp
            001 - Upper Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100001
                    Fault Priority: 6
                    Fault Frequency: 3
                    Reset counter: 61
                    Mileage: 196962 km
                    Time Indication: 0
                    Date: 2021.07.02
                    Time: 11:57:19

             Freeze Frame:
                    Error Code: 68


-------------------------------------------------------------------------------
Address 3D: Special Function        Labels: 8K0-907-440.clb
   Part No SW: 8K0 907 440     HW: 8K0 907 440
   Component: STS             H04 0040
   Revision: S0H04000    Serial number: 00000000045860
   Coding: 01010101000000000000000202
   Shop #: WSC 31414 790 00001
   VCID: 6BD448044A7590D306-803E

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:. 4F0-959-793.clb
   Part No SW: 4F0 959 793 T    HW: 8K0 959 793 M
   Component: TSG FA        H12 0362
   Revision:             Serial number: 0000011339294
   Coding: 011F06205061440004
   Shop #: WSC 31414 790 00001
   VCID: 489ED788FB439BCB4B-801C

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 4L0-910-289.lbl
   Part No SW: 4L0 910 289 H    HW: 4L0 907 289 H
   Component: Komfortgeraet   H10 0110
   Revision: 0110 ---    Serial number: 01549431100000
   Coding: 4071675
   Shop #: WSC 31414 790 00001
   VCID: 3560AE7C5CB1162320-8060

   Subsystem 1 - Component:   Sounder No Answer  

   Subsystem 2 - Component:      IRUE No Answer  

3 Faults Found:
01135 - Interior Monitoring Sensors
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 3
                    Fault Frequency: 254
                    Reset counter: 21
                    Mileage: 119751 km
                    Time Indication: 0
                    Date: 2017.11.20
                    Time: 16:02:12

01134 - Alarm Horn (H12)
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 3
                    Fault Frequency: 135
                    Reset counter: 77
                    Mileage: 119751 km
                    Time Indication: 0
                    Date: 2017.11.20
                    Time: 16:16:46

01134 - Alarm Horn (H12)
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 3
                    Fault Frequency: 135
                    Reset counter: 77
                    Mileage: 119751 km
                    Time Indication: 0
                    Date: 2017.11.20
                    Time: 16:16:46


-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II        Labels: 4F0-910-280.lbl
   Part No SW: 4F0 910 280     HW: 4F0 907 280 E
   Component: ILM Beifahrer   H14 0100
   Revision:             Serial number: 00000000236929
   Coding: 0011101
   Shop #: WSC 31414 790 00001
   VCID: 5EB211D089C7F57B91-800A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels:. 4F0-959-792.clb
   Part No SW: 4F0 959 792 T    HW: 8K0 959 792 M
   Component: TSG BF        H12 0362
   Revision:             Serial number: 0000011505224
   Coding: 011F06205C61440004
   Shop #: WSC 31414 790 00001
   VCID: 479CD4B4F65D94B342-8012

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 8P0-907-357.lbl
   Part No: 8P0 907 357 H
   Component: Dynamische LWR  H02 0010
   Revision: 00000001    Serial number:            
   Coding: 0000008
   Shop #: WSC 31414 790 00001
   VCID: 3F8CCC546E8DDC73FA-806A

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (R)       Labels: Redir Fail!
   Part No SW: 4G0 035 056 J    HW: 4G0 035 056
   Component: Radio U STD   H52 0133
   Revision: AB001007    Serial number: 051H00B7529478
   Coding: 010003020100000000
   Shop #: WSC 31414 790 00001
   VCID: 285E77085B037BCBAB-807C

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:. 4E0-035-6xx-5F.clb
   Part No SW: 4L2 035 670 N    HW: 4L2 035 670
   Component: H-BNT-EU      H42 1036
   Revision: --------    Serial number: 075GU0B7501506
Coding: 180101060004D3EF01000355EF632003040000000100000000
   Shop #: WSC 00481 210 83561
   VCID: 3560AE7C9CB1162320-8060

   Subsystem 1 - Part No: 8R0 060 884 HF
   Component: EUR 2020/2021  3101

   Subsystem 2 - Part No SW: 8R0 919 604     HW: 8R0 919 604
   Component: DU7 High  H41 0104
   Serial number: A130GZ0BS000801  

   Subsystem 3 - Part No SW: 4L0 919 614 B    HW: 4L0 919 614 B
   Component: E0380 Bedient  H01 0060
   Serial number: 00000001889204    

   Subsystem 4 - Part No: 8R0 060 961 B
   Component: CD-Database  3371

1 Fault Found:
01043 - Control Module; Incorrect Software Version
            000 - -
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 21
                    Mileage: 197369 km
                    Time Indication: 0
                    Date: 2021.07.12
                    Time: 13:01:05

             Freeze Frame:
                    Bin. Bits: 00000000 00000000
                    Bin. Bits: 00000000 00000000
                    Bin. Bits: 00000000 00000000
                    Bin. Bits: 00000000 00000000
                    Bin. Bits: 00000000 00000000
                    Bin. Bits: 00000000 00000010


-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels:. 4F0-959-795.clb
   Part No SW: 4F0 959 795 P    HW: 4F0 959 795 P
   Component: TSG HL        H11 0362
   Revision:             Serial number: 0000011592807
   Coding: 010E06204061230004
   Shop #: WSC 31414 790 00001
   VCID: 4682D9B0F1578DBBB9-8012

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer (J345)       Labels:. 4E0-907-383.clb
   Part No SW: 4E0 907 383 J    HW: 4E0 907 383 J
   Component: Anhaenger     H09 0100
   Revision: 2A001001    Serial number: 00000159164934
   Coding: 0100000000000000
   Shop #: WSC 00000 000 00000
   VCID: 31689A6C68D93A037C-8064

No fault code found.

-------------------------------------------------------------------------------
Address 6C: Back-up Cam.        Labels: 4L0-910-441.clb
   Part No SW: 4L0 910 441 B    HW: 4L0 907 441 B
   Component: J772__Rearview      0030
   Revision: --H05---    Serial number: 525PA8-J18437V
   Coding: 1020201
   Shop #: WSC 00481 210 83561
   VCID: 25407E3CEC1166A390-8070

No fault code found.

-------------------------------------------------------------------------------
Address 6D: Trunk Elect.        Labels: 4L0-910-945.clb
   Part No SW: 4L0 910 945     HW: 4L0 827 851 E
   Component: ValeoHeckdeckel H56 0500
   Revision: --H56001    Serial number: E5030000B  
   Shop #: WSC 98765 666 38354
   VCID: 6CD64B184F7B97EB0F-8038

   Subsystem 1 - Part No: 4L0 910 946
   Component: ValeoHeckdeckel H56 0500

   Subsystem 2 - Serial number: E5030100B  

   Subsystem 3 - Serial number: RD08.08.11--H56001001B0057ÿ

   Subsystem 4 - Serial number: 1B0057ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 6F: Centr. Conv. II        Labels:. 4L0-910-290.lbl
   Part No SW: 4L0 910 290 A    HW: 4L0 907 290 A
   Component: ILM HINTEN 2    H07 0080
   Revision: AAH07080    Serial number: 118331833-----
   Coding: 0003587
   Shop #: WSC 31414 790 00001
   VCID: 2642793091176DBB99-8072

   Subsystem 1 - Part No: 4L0 910 591 A
   Component: J_245_EE16_SKB10H11 0220

   Subsystem 2 - Part No: 4L0 910 591 A
   Component: J_394_EE16_SKB10H11 0220

   Subsystem 3 - Part No: 4L0 910 591 A
   Component: J_392_EE16_SKB10H11 0220

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels:. 4F0-959-795.clb
   Part No SW: 4F0 959 795 P    HW: 4F0 959 795 P
   Component: TSG HR        H11 0362
   Revision:             Serial number: 0000011593325
   Coding: 010E06204061230004
   Shop #: WSC 31414 790 00001
   VCID: 4682D9B0F1578DBBB9-8012

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 4Fx-910-283.lbl
   Part No SW: 4L0 910 283 E    HW: 4L0 919 283 E
   Component: Parkhilfe 8-Kan H03 0100
   Revision: 00H03000    Serial number: 37331120707657
   Coding: 0231046
   Shop #: WSC 12345 123 12345
   VCID: 2C568B188FFB57EB4F-8078

No fault code found.

End-------------------------(Elapsed Time: 03:41)--------------------------
 
Last edited:
   #2  

downtime

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Have you tried looking at the measurement values on module 34 level control? I presume the acceleration sensors are connected to that as in DCC cars in other VAG range?
 
   #3  

JonnyBhoy

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Have you tried looking at the measurement values on module 34 level control? I presume the acceleration sensors are connected to that as in DCC cars in other VAG range?
I'm on that just now and found 'Group 12 - build-up acceleration'.

'Set-up address front left' reads a constant 3.84V, no fluctuation.

'Set-up address front right' fluctuates slightly between 2.43 and 2.45V.

'Set up position rear' also fluctuates slightly between 2.43 and 2.45V.

Took it for a test drive while measuring...front left remains fixed at 3.84V while all other values changed and responded to driving inputs.

1. Is this measure actually reading the acceleration sensors?
2. Does the lack of voltage change mean this sensor/wiring looks like it has a fault?

Thanks!
 
   #4  

JonnyBhoy

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I'm on that just now and found 'Group 12 - build-up acceleration'.

'Set-up address front left' reads a constant 3.84V, no fluctuation.

'Set-up address front right' fluctuates slightly between 2.43 and 2.45V.

'Set up position rear' also fluctuates slightly between 2.43 and 2.45V.

Took it for a test drive while measuring...front left remains fixed at 3.84V while all other values changed and responded to driving inputs.

1. Is this measure actually reading the acceleration sensors?
2. Does the lack of voltage change mean this sensor/wiring looks like it has a fault?

Thanks!
Ross-Tech - can you please respond? No reply to my email with an answer...
 
   #5  

PetrolDave

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I'm on that just now and found 'Group 12 - build-up acceleration'.

'Set-up address front left' reads a constant 3.84V, no fluctuation.

'Set-up address front right' fluctuates slightly between 2.43 and 2.45V.

'Set up position rear' also fluctuates slightly between 2.43 and 2.45V.

Took it for a test drive while measuring...front left remains fixed at 3.84V while all other values changed and responded to driving inputs.

1. Is this measure actually reading the acceleration sensors?
2. Does the lack of voltage change mean this sensor/wiring looks like it has a fault?

Thanks!
Constant 3.84V says to me that the sensor is probably connected but either faulty or not mechanically connected to the suspension?

Have you done a Mark 1 eyeball check on the sensor?

P.S. Remember the 5 hour timezone difference between the UK and the US where Ross-Tech are based ;)
 
   #6  

NEtech

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Specification: 2.3...2.6 V
So Left Front sensor defective or 5V supply to sensor or wiring problem.
 
   #7  

JonnyBhoy

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Constant 3.84V says to me that the sensor is probably connected but either faulty or not mechanically connected to the suspension?

Have you done a Mark 1 eyeball check on the sensor?

P.S. Remember the 5 hour timezone difference between the UK and the US where Ross-Tech are based ;)
The sensor is going to be checked tomorrow. I'll post an update when I have one.
 
   #8  

JonnyBhoy

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Specification: 2.3...2.6 V
So Left Front sensor defective or 5V supply to sensor or wiring problem.
Where did you find out the specification please?
 
   #9  

NEtech

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Hold the mouse over field 1, 2, 3 (There is a misspellings in field 1)
Also you have a DTC for left front, that show 3.8x V
No DTC for field 2 + 3 that show 2.4x V
 
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