Resolved Oxygen Sensor Issues C5 Allroad

Resolved
   #1  

Coopkaedin240

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Hey guys! I am in need of some assistance over here, I have these two codes for my b2s2 O2 Sensor and have replaced the sensor and the fuses/relays, still no avail and the code comes back after a little bit of drive time. Going to check the resistance of the new sensor and the resistance from the harness to the ECU. If those the wiring comes back as good, and I am unable to find an issue would my next step to be replace the ECU, maybe the driver for b2s2 has went bad? Any other ideas or is there anything I'm missing here?

Code:
Wednesday,22,May,2024,08:19:41:33053
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 24.5.0.0 (x64)
Data version: 20240429 DS355.0
www.Ross-Tech.com

Dealer/Shop Name: Eurowerkz

VIN: WA1YD64B55N024059   License Plate:



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


Chassis Type: 4B (4B - Audi A6/S6/RS6/allroad C5 (1998 > 2005))
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
          75 76 77
 
VIN: WA1YD64B55N024059   
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 078-907-551-AZA.lbl
   Part No: 4Z7 907 551 T
   Component: 2.7L V6/5VT     G   M003 
   Coding: 07755
   Shop #: WSC 88641 
   VCID: 54A7230EA47A5236B7-5140
   WA1YD64B55N024059     AUZ7Z0D2675858

3 Faults Found:
17548 - Oxygen (Lambda) Sensor; B2 S2
            P1140 - 35-00 - Internal Resistance too High
16544 - Oxygen (Lambda) Sensor B2 S2
            P0160 - 35-00 - No Activity
18032 - MIL Request Signal Active (Check TCM for errors too!)
            P1624 - 35-00 -
Readiness: 0010 0001

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 01V-927-156.lbl
   Part No: 4Z7 927 156 T
   Component: AG5 01V 2.7l5VT USA 0505 
   Coding: 0001002
   Shop #: WSC 02334 785 00200
   VCID: 57BDD402E58C792E52-5140

1 Fault Found:
17125 - Torque Converter Clutch
            P0741 - 003 - Stuck OFF / No Power being transferred - MIL ON

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8D0-907-389.lbl
   Part No: 4Z7 907 389 A
   Component: ABS/ESP allrad      D66 
   Coding: 06497
   Shop #: WSC 02334 
   VCID: 4A9B3D76763E14C6DD-5140

1 Fault Found:
00526 - Brake Light Switch (F)
            36-10 - Open Circuit - Intermittent

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 4B0-820-043-MY2.lbl
   Part No: 4B0 820 043 AR
   Component: A6-Klimavollautomat 0208 
   Coding: 00010
   Shop #: WSC 22011 
   VCID: 6ADB9DF616FEF4C6FD-2580

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4B0-959-655-AI84.lbl
   Part No: 4Z7 959 655 N
   Component: Airbag 8.4EP        1000 
   Coding: 0000607
   Shop #: WSC 02334 785 00200
   VCID: 5ABBCD36969E64466D-5140

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 4B0-907-487.lbl
   Part No: 4B0 907 487 F
   Component: Lenkradelektronik   D01   
   Coding: 01002
   Shop #: WSC 02334 
   VCID: 2F6D4CE2ED9C51EEEA-5140

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4B0-920-xxx-17.lbl
   Part No: 4B0 920 983 F
   Component: KOMBI+WEGFAHRS. VDO D17 
   Coding: 20264
   Shop #: WSC 02235 
   VCID: 2B5558F2D9842DCEC6-5140
   WA1YD64B55N024059     AUZ7Z0D2675858

No fault code found.

-------------------------------------------------------------------------------
Address 34: Level Control        Labels: 4Z7-907-553.lbl
   Part No: 4Z7 907 553 F
   Component:  - 2C1A1          D060   
   Coding: 25500
   Shop #: WSC 00180 
   VCID: 489F077E6832E6D6CB-5140

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 4B0-962-258.clb
   Part No: 4B0 962 258 M
   Component: Central Lock/Alarm  D38 
   Coding: 15950
   Shop #: WSC 02335 
   VCID: 3365409201B4750E8E-4ECE

6 Faults Found:
01371 - Alarm triggered by Door Contact Switch; Driver's Side
            35-00 - -
01374 - Alarm triggered by Terminal 15
            35-00 - -
01369 - Alarm triggered by Hood Switch
            35-00 - -
01559 - Drivers Door
            59-10 - Can't Unlock - Intermittent
01560 - Passenger Door
            59-10 - Can't Unlock - Intermittent
01562 - Rear right door
            59-10 - Can't Unlock - Intermittent

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr        Labels: None
   Part No: 4B0 959 760 B
   Component: Sitzmemory R1 F     0204 
   Coding: 00001
   Shop #: WSC 00000 
   VCID: 2C575BEEDC8A2AF6CF-4B1A

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4Z7-907-357.lbl
   Part No: 4Z7 907 357
   Component: dynamische LWR       D09 
   Coding: 00030
   Shop #: WSC 02334 
   VCID: 0407D34E149A02B667-4B32

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 8Z0-919-283.lbl
   Part No: 8Z0 919 283
   Component: Parkingsyst. A6 RDW D08 
   Coding: 01186
   Shop #: WSC 02334 
   VCID: 020BD5560E8E0C8655-5140

No fault code found.

End-------------------------(Elapsed Time: 05:05)--------------------------
 
   #3  

Coopkaedin240

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I got the Sensor from Bosch was a "universal" one for the downstream yes and it was the only option world Pac showed for my car, that being said world pac is wrong a lot
 
   #5  

davisev5225

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In my experience, WorldPAC is rarely wrong, and 16978 does indeed appear to be the correct part, though 16073 is also valid.

Did you source the sensor from WorldPAC, or somewhere else?
 
   #6  

Coopkaedin240

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I did source it from WorldPac and I see the other sensor has the connector for older models but mine has newer connectors. I did have to take the pins out and re pin a stock harness as it was not right. And from everywhere I've looked I don't see a sensor that comes with the connector that my car has.
 
   #10  

Coopkaedin240

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UPDATE: Checked resistance from the ECU to the O2 Sensor and have found that there is 0.3 Ohms of resistance in the wire, now I'm no expert but shouldn't there be no resistance in this wire? It is only about a foot long.
 
   #11  

davisev5225

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0.3 Ohms doesn't sound terrible, but if the sensor is marginal, it might be enough. Have you checked some of the other wires leading back into the ECU?

You can also try cleaning the contacts in both the ECU and the plug that connects to the ECU. They might have surface corrosion built up given how old the car is.
 
   #12  

Coopkaedin240

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I did not check any of the other wires, just the three that head to the ecu from the sensor which all read 0.3 ohms, should I check more? and Ill try cleaning it!
 
   #13  

Uwe

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Checked resistance from the ECU to the O2 Sensor and have found that there is 0.3 Ohms of resistance in the wire, now I'm no expert but shouldn't there be no resistance in this wire? It is only about a foot long.
There is resistance in every wire that isn't a superconductor. It may be milli-ohms, but it's not zero.

A regular old multimeter is terrible at reading low resistances (like below 1 ohm). What does it read when you connect both leads together?

-Uwe-
 
   #15  

Coopkaedin240

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There is resistance in every wire that isn't a superconductor. It may be milli-ohms, but it's not zero.

A regular old multimeter is terrible at reading low resistances (like below 1 ohm). What does it read when you connect both leads together?

-Uwe-
000.1 Ohms when shorted with multimeter, and welcome to the party Uwe!

Is this fault code referring to the heater circuit having a high resistance? If so, do you know the tolerance of what is "too high"?
 
   #16  

Uwe

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000.1 Ohms when shorted with multimeter,
OK, so call it 0.2 ohms in the wire. That doesn't strike me as a problem.

Is this fault code referring to the heater circuit having a high resistance? If so, do you know the tolerance of what is "too high"?
Wait. Where does this fault code mention "Heater circuit"?
17548 - Oxygen (Lambda) Sensor; B2 S2
P1140 - 35-00 - Internal Resistance too High

-Uwe-
 
   #17  

Coopkaedin240

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OK, so call it 0.2 ohms in the wire. That doesn't strike me as a problem.


Wait. Where does this fault code mention "Heater circuit"?


-Uwe-
Well usually when I see a code for that it has something about heater in there but obviously not in this case, hence my confusion. In that case do you know what would be considered as "too high" for the sensor resistance?

And what exactly does 17548 entail? I'm looking on the wiki and it says to probable cause could be the O2 sensor control faulty, in my case is that the O2 Driver in my ECU? And how can I test said driver?
 
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   #18  

Uwe

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do you know what would be considered as "too high" for the sensor resistance?
No, I don't.

Doesn't this car have two post-Cat sensors? How about swapping them to see if the problem moves from Bank 2 to Bank 1?

-Uwe-
 
   #19  

Coopkaedin240

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It does, but the connectors are different...

I can check resistance of both sensors for reference though
 
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