Vacuum Sensor Fail ?

[colchald]

Hi Group,

Gets car back from dealer after them doing a battery check and found this fault.

No warning lights showing in instrument cluster.

When I attempt to erase it the fault immediately comes back up & a weird clunking noise can be heard coming from under the bonnet.

Thanks In Advance.

Sunday,04,May,2025,19:16:37:62900
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 25.3.1.1 (x64)  HEX-V2 CB: 0.4671.4
Data version: 20250415 DS365.0
www.Ross-Tech.com


VIN: WVWZZZ6RZGU083433   License Plate: GX66KVH
Mileage: 34678km-21547mi   Repair Order:


Chassis Type: 6R-VW26 (6C0)
Scan: 01 02 03 08 09 10 15 17 19 44 5F

VIN: WVWZZZ6RZGU083433   Mileage: 34678km-21547miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: Malfunction 0010
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
5F-Information Electr. -- Status: Malfunction 0010
-------------------------------------------------------------------------------
Address 01: Engine (J623-CJZC)       Labels:. 04E-907-309-V1.clb
   Part No SW: 04E 906 027 BB    HW: 04E 907 309 AF
   Component: R4 1.2l TFS   H23 9085
   Revision: R4H23---    CVN: 16A91C2B
   Coding: 01250032232411080000
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_ECM12TFS01104E906027BB 001009
   ROD: EV_ECM12TFS01104E906027BB_VW26.rod
   VCID: 6597BAEAD5EE9D621CC-8030
   VINID: 9E69EAAAA1A2A979402031030C08A23D1E

   Center armrest control head 1:

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans (J743)       Labels: 0CW-927-769.clb
   Part No SW: 0CW 300 048 S    HW: 0AM 927 769 K
   Component: GSG DQ200-MQB H43 6501
   Revision: 00043014    Serial number: CU501604265901 CVN: 0000EB84
   Coding: 0014
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_TCMDQ200021 001001
   ROD: EV_TCMDQ200021.rod
   VCID: 4CC16F4E56444C2A232-8018

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 6R0-907-37x-ESP90.clb
   Part No SW: 6C0 907 379 K    HW: 6R0 907 379 BA
   Component: ESP9.0i       H03 0004
   Serial number: 08503386160509 Dataset Number: V03935226BE 0124
   Coding: 23DD2885892B33C31118106C0054C41491CC88080005CB098F00
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_Brake1ESP90iBOSCHPQ26 100020
   ROD: EV_Brake1ESP90iBOSCHPQ26_VW26.rod
   VCID: 372B20A23FC2DFF27E0-8062

1 Fault Found:
1031 - Vacuum sensor
          C10A3 01 [00001001] - Electrical Failure
          [VacSent1Sensor]
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 222
                    Mileage: 34677 km
                    Date: 2025.05.03
                    Time: 10:03:10


-------------------------------------------------------------------------------
Address 08: Auto HVAC (J301)       Labels:| 6C0-820-045.clb
   Part No SW: 6C0 820 045 E    HW: 6C0 820 045 E
   Component: AC Manuell    H03 0203
   Serial number:  1606121B-0201 Dataset Number: V03935233RN 0012
   Coding: 200100001000100000
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_ACManueKMMValeoPQ26 002001
   ROD: EV_ACManueKMMValeoPQ26_VW26.rod
   VCID: 211FEEFA8146B142A04-8074

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:| 6C0-937-089-V1.clb
   Part No SW: 6C0 937 089 C    HW: 6C0 937 089
   Component: BCM PQ26 Hi4R H08 0087
   Serial number: 006098187917 Dataset Number: V03935235CN 0001
   Coding: 0300184042530A7B0FA44080B12703C810005B0257010000000000000000
   Shop #: WSC 131071 1023 2097151
   ASAM Dataset: EV_BCMA0 005005
   ROD: EV_BCMA0_005.rod
   VCID: 30391BBEDAAC08CA3FA-8064

   Rain/Light Recognition Sensor:
   Subsystem 1 - Part No SW: 5Q0 955 559 A    HW: 5Q0 955 559 A  Labels: 5Q0-955-547.CLB
   Component: RLS  037 0059
   Serial number: S2Y16M05D18H04M25S54
   Coding: 9038DD

   Driver door control module:
   Subsystem 2 - Part No SW: 6R0 959 802 DM    HW: 6R0 959 802 DM  Labels: 6R0-959-802.CLB
   Component: J386__TSG_FT  003 0610
   Serial number: KU0KU010051661314369
   Coding: 1400A1

   Front passenger door control module:
   Subsystem 3 - Part No SW: 6R0 959 801 DK    HW: 6R0 959 801 DK  Labels: 6R0-959-801.CLB
   Component: J387__TSG_BT  003 0610
   Serial number: KU0KU002051661238643
   Coding: 0400A1

   Anti-theft alarm system sensor:
   Subsystem 4 - Part No SW: 6C0 951 171     HW: 5Q0 951 171
   Component: Sensor, DWA  005 0316
   Serial number: 000000000ZY1609602ZV

   Alarm horn:
   Subsystem 5 - Part No SW: 5Q0 951 605 A    HW: 5Q0 951 605 A
   Component: Sirene, DWA  005 0313
   Serial number: 00000000000065214829

   Rear Driver Side Door Control Module:
   Subsystem 6 - Part No SW: 6R0 959 812 AA    HW: 6R0 959 812 AA
   Component: J389__TSG_HR  003 0610
   Serial number: KU0KU017051661386131
   Coding: 1400A0

   Rear Passenger Door Control Module:
   Subsystem 7 - Part No SW: 6R0 959 811 AA    HW: 6R0 959 811 AA
   Component: J388__TSG_HL  003 0610
   Serial number: KU0KU009051661300167
   Coding: 0400A0

No fault code found.

-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 5Q0-919-294.clb
   Part No SW: 5Q0 919 294 K    HW: 5Q0 919 294 A
   Component: PARKHILFE 8K  H03 0054
   Revision: --------    Serial number: 39331612511036 Dataset Number: V03935217LK 0021
   Coding: 0031151011
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_EPHVA18AU3700000 002026
   ROD: EV_EPHVA18AU3700000_VW26.rod
   VCID: 43D344727B1A8352D28-8016

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 6C0-959-655.clb
   Part No SW: 6C0 959 655 J    HW: 6C0 959 655 J
   Component: VW20Airbag00C 002 0380
   Revision: --------    Serial number: 003TH006FYW7 Dataset Number: V03935228DW 0583
   Coding: 88C0C000000000005C000000008800000000
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_AirbaVW20BPAVW26X 001001
   ROD: EV_AirbaVW20BPAVW26X.rod
   VCID: 3A2D39960CD0C29A81E-806E

   Crash sensor for side airbag: driver side:
   Subsystem 1 - Part No SW: -----------    HW: 410 822 504 16
   Component: SideSensor_Df  151 0800
   Serial number: 3575H00A9209A1C0B31J
   Coding: 2D2D2D

   Crash sensor for side airbag: passenger side:
   Subsystem 2 - Part No SW: -----------    HW: 410 822 504 16
   Component: SideSensor_Pf  151 0800
   Serial number: 3585H00AB2085D22737M
   Coding: 2D2D2D

   Rear Side Airbag Crash Sensor (on driver's side):
   Subsystem 3 - Part No SW: -----------    HW: 442 152 404 16
   Component: SideSensor_Dr  1CA 0148
   Serial number: 3517A00AB1D72E54A1EW
   Coding: 2D2D2D

   Passenger side rear thorax airbag crash sensor:
   Subsystem 4 - Part No SW: -----------    HW: 442 150 303 16
   Component: SideSensor_Pr  1CA 0148
   Serial number: 3527A00C71F9D274643O
   Coding: 2D2D2D

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 6C0-920-KOM-V1.clb-SRI3
   Part No SW: 6C0 920 940 C    HW: 6C0 920 940 C
   Component: KOMBI         201 1420
   Coding: 272409082180260001082A001000000000000000
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_DashBoardVDDMQBAB 009046
   ROD: EV_DashBoardVDDMQBAB_009_VW26.rod
   VCID: 2411E7EE9E54A46ACB2-8070

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:| 6C0-909-901-V1.clb
   Part No SW: 6C0 909 901     HW: 6C0 937 089
   Component: GW MQB A0     H08 0087
   Revision: --------    Serial number: 006098187917 Dataset Number: V03935009T0043
   Coding: 030100046F0A560071000000000000010001010000000000000000000000
   Shop #: WSC 131071 1023 2097151
   GVL: 01443C0000000000400000000000C80000000000000000000000000000000000
   ASAM Dataset: EV_GatewA0Lear 013020
   ROD: EV_GatewA0Lear_013_VW26.rod
   VCID: 6597BAEAD5EE9D621CC-8030

   Multifunction steering wheel control module:
   Subsystem 1 - Part No SW: 6C0 959 442 A    HW: 6C0 959 442 A  Labels: 3C8-959-537.CLB
   Component: E221__MFL-TAT  H06 0023
   Serial number: 1261605082100661AD2B
   Coding: 280000

   Battery Monitoring Control Module:
   Subsystem 2 - Part No SW: 6C0 915 181 A    HW: 6C0 915 181 A
   Component: J367-BDM  H08 0223
   Serial number: 53123G42062821043644

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist (J792)       Labels:| 6Rx-909-144-V2.clb
   Part No SW: 6C2 909 144 AG    HW: 6C2 909 144 D
   Component: EPS_TRW_ALow  322 3232
   Serial number: CG6I1299 Dataset Number: V03935224VJ 0548
   Coding: 000700
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_SteerAssisUDSTRW 016026
   ROD: EV_SteerAssisUDSTRW.rod
   VCID: 6E85C5C600185E3A6D6-803A

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:| 5G0-035-MIB-STD2.clb
   Part No SW: 3Q0 035 842 A    HW: 3Q0 035 842 A
   Component: MU-S-D-ER     H24 0245
   Serial number: VWZAZ2S0228166 Dataset Number: 5G0CV1v____ 0001
   Coding: 02620000BE00000051111101008808001F0100D60120010003
   Shop #: WSC 31414 790 50316
   ASAM Dataset: EV_MUStd4CTSAT 001022
   ROD: EV_MUStd4CTSAT_VW26.rod
   VCID: 2B030CD2F38A6B120A8-807E

   Display and control head 1 for information electronics:
   Subsystem 1 - Part No SW: 6C0 919 603 B    HW: 6C0 919 603 B
   Component: ABTm_Std2  H53 1031
   Serial number: VWZ8Z9SKW00TQB   

1 Fault Found:
0012 - Digital Radio Antenna
          B1103 11 [00001001] - Short to Ground
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 213
                    Mileage: 34608 km
                    Date: 2025.04.28
                    Time: 15:23:56

                    Voltage terminal 30: 14.7 V
                    Status of digital radio antenna 1-Antenna current: 0 mA
                    Status of digital radio antenna 1-Connection between radio and antenna amplifier: electrically OK
                    Status of digital radio antenna 1-Connection between antenna amplifier and antenna: electrically OK
                    Status of digital radio antenna 1-DAB_Bit_Error_Rate_FIC: 0.000000
                    Status of digital radio antenna 1-DAB_Bit_Error_Rate_MSC: 0.000000


End----(Elapsed Time: 01:05, VBatt start/end: 12.1V/11.9V. VIgn 11.9V)-----
------------------------------2 Faults Found-------------------------------

 

[TTT]

Get documentation and find where sensor lives. Step 1: visual inspection.

 

[colchald]

Get documentation and find where sensor lives. Step 1: visual inspection.

TTT Thanks for your speedy response ! What sort of documentation and where? I've checked for videos on its location but can't find so far.

 

[TTT]

Erwin subscription (is in UK 1h available for cheap?) and click pdf downloads as fast as you can.

Vacuum sensor should be in the vacuum line between brake booster and intake manifold or vacuum pump. I don’t know your vehicle’s configuration.

 

[colchald]

I have two photos of my engine bay. Could I post a link here for you to view them from my Facebook as I'm having trouble getting Imgur to work.

 

[Crasher]

The sensor is part only available (genuine VW that is) with the brake servo pipe, number 6C0 612 041 L and £158.40 retail inc. from a VW main dealer or TPS if they will serve you without an account. Don’t be tempted to drive it like this, it can cause the ABS pump to fail and that’s another £1146 on top. I hope Uwe doesn’t mind the image source? I am at home so can’t do it properly.

 

[Boki Ar]

If there's no other way to post them here, I'll download them and post them on imgur.

 

[Crasher]

That was a quick thumbs up

 

[colchald]

The sensor is part only available (genuine VW that is) with the brake servo pipe, number 6C0 612 041 L and £158.40 retail inc. from a VW main dealer or TPS if they will serve you without an account. Don’t be tempted to drive it like this, it can cause the ABS pump to fail and that’s another £1146 on top. I hope Uwe doesn’t mind the image source? I am at home so can’t do it properly.

Thank You Crasher.
Does the vacuum sensor put the ABS Warning light on in the cluster if the vacuum pump has failed or failing? And if the vacuum Sensor has malfunctioned, will that automatically cause the pump to fail ?

 

[Dr Sheldon]

Does the vacuum sensor put the ABS Warning light on in the cluster if the vacuum pump has failed or failing? And if the vacuum Sensor has malfunctioned, will that automatically cause the pump to fail ?

A failed Vacuum Sensor, Essential for correct brake operation will light up the ABS Warning lamp for sure.


For some reason, that I cannot fathom, a failed vacuum sensor if not addressed will very soon cause problems in the ABS Module requiring replacement or repair - Neither of which is cheap.

We have no clue how much you have driven the car since that error occured so it may or may not already have done the damage !!

Replace the sensor ensuring it is not in fact a wiring or connector issue then you will know where you are.

 

[Dr Sheldon]

Adding to the above ^^ - Yes indeed the sensor could be ok but the Vacuum pump has failed. I guess if that was the case you would be moaning about a very Solid / Hard brake pedal with little servo assistance.

 

[colchald]

Adding to the above ^^ - Yes indeed the sensor could be ok but the Vacuum pump has failed. I guess if that was the case you would be moaning about a very Solid / Hard brake pedal with little servo assistance.

It's the vacuum Sensor that has had an electrical failure & malfunction. According to a VCDS Scan.

 

[Dr Sheldon]

It's the vacuum Sensor that has had an electrical failure & malfunction. According to a VCDS Scan.

More accurately according to the DTC that your module is delivering to VCDS. VCDS will read it and display it on your screen. VCDS plays no part in generating or choosing the the DTC. It is just a messenger.


That is quite likely a very accurate DTC and Description however a broken wire, poor connection may or may not throw the same DTC at you.

Worth checking in my book. MVB for Vacuum vs Actual measured Vacuum will guide you.

The failure you have is so common that the chances of it not being the Vacuum sensor is small, tiny ! Add to that you are not moaning about a hard pedal confirms that the Vacuum pump is working.

Replace the Vacuum Sensor, Wiring confirmed, then replace the ABS module if needed. It is that simple !!

 

[PetrolDave]

Could I post a link here for you to view them from my Facebook

No, many of us refuse to use Facebook

 

[colchald]

More accurately according to the DTC that your module is delivering to VCDS. VCDS will read it and display it on your screen. VCDS plays no part in generating or choosing the the DTC. It is just a messenger.


That is quite likely a very accurate DTC and Description however a broken wire, poor connection may or may not throw the same DTC at you.

Worth checking in my book. MVB for Vacuum vs Actual measured Vacuum will guide you.

The failure you have is so common that the chances of it not being the Vacuum sensor is small, tiny ! Add to that you are not moaning about a hard pedal confirms that the Vacuum pump is working.

Replace the Vacuum Sensor, Wiring confirmed, then replace the ABS module if needed. It is that simple !!lI

 

[colchald]

I'll call the VW Dealership tomorrow to get it booked in as I've only had the car a few weeks. It's already been in for a battery losing its charge. They drained it & recharged it overnight & it's still the same.

 

[Crasher]

I am not sure if the Polo is affected the same way because with the ones I have seen, I have pushed to get it done ASAP. On the Q7, Q5, TOERAG 3 and one Passat 8, the ABS pump has been damaged. People usually take notice of this fault not because of the warning light, which doesn’t always come on, but the braking action where the ABS pump itself starts to supplement the brake pressure and so the car feels odd and makes noises from the pump, which then fails. With a Q5 we did where the sensor failed and then the pump, the owner had a warranty (I hate warranty companies), they paid for the sensor but not the £3k pump as that was consequential damage that could have been avoided with prompt action and I agreed with them.

 

[colchald]

I am not sure if the Polo is affected the same way because with the ones I have seen, I have pushed to get it done ASAP. On the Q7, Q5, TOERAG 3 and one Passat 8, the ABS pump has been damaged. People usually take notice of this fault not because of the warning light, which doesn’t always come on, but the braking action where the ABS pump itself starts to supplement the brake pressure and so the car feels odd and makes noises from the pump, which then fails. With a Q5 we did where the sensor failed and then the pump, the owner had a warranty (I hate warranty companies), they paid for the sensor but not the £3k pump as that was consequential damage that could have been avoided with prompt action and I agreed with them.

I need to get it in soon then. I'm starting to wish I kept my original 2010 Polo. It had just over 120,000 on the clock with some bodywork damage & got tempted with a newer model with only 20,000 on the clock.
I have a feeling the newer cars aren't as reliable & durable.

 

[Crasher]

They are less prone to actually braking down but with the level of complexity even a current Polo has, more prone to faults and much more complex to repair. I am rebuilding a 1995 Audi S2, in its day I viewed it as being scarily complex but now it is less worrying to work on than a current generation Polo and the 2019 S8 I did a few weeks back, bloody daunting prospect to work on, I have never done a scan that had that many ECU’S.

 

[TTT]

my Facebook

god forbid!!!