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Wolfgang
Wolfgang, Audi master tech
Category: Audi
Satisfied Customers: 4215
Experience:  Senior Audi Master Tech 15 yrs
19871424
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Audi A4 Quattro: . I'm currently being plagued with a

Customer Question

Hello. I'm currently being plagued with a very strange CEL code that is telling me that my B1S1 oxygen sensor has a circuit malfunction. Here's the back story on the problem.
Two months ago, I purchased a new set of downpipes for my 2004 Audi A4 3.0 and an ECU software upgrade from a shop in California.
Drove car for two weeks with only ECU upgrade. Car seemed to run odd but attributed that to not having installed the downpipes yet. During normal acceleration to 35-40mph I would feel the car pull back timing and recover (smooth, rough, smooth).
Installed downpipes and re-used all 4 OEM O2 sensors.
Drove the car this way for a month and there were no CELs at any time. Car’s exhaust note was rough sounding under part throttle and also has a strange note on deccel (causes a loud buzzing sound from downpipes, NO LEAKS).
May 5: Drove to work, CEL lit up. Checked codes that night:
VAG-COM Version: Release 311.2-N
Control Module Part Number: 8E0 909 559 D
Component and/or Version: JHM* V3/9X G 0003
Software Coding:(###) ###-####
Work Shop Code: WSC 06435
3 Faults Found:
16497 - Intake Air Temp. Sensor (G42): Signal too High P0113 - 002 - Lower Limit Exceeded - Intermittent
16502 - Engine Coolant Temp. Sensor (G62): Signal too High P0118 - 002 - Lower Limit Exceeded - Intermittent
16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit P0130 - 008 - Implausible Signal
May 5: Cleared all codes and drove to work next day.
May 6: CEL came on and checked codes:
VAG-COM Version: Release 311.2-N
Control Module Part Number: 8E0 909 559 D
Component and/or Version: JHM* V3/9X G 0003
Software Coding:(###) ###-####
Work Shop Code: WSC 06435
1 Fault Found:
16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit P0130 - 008 - Implausible Signal
May 8: Bought new Bosch sensor from Autozone Bosch #17353 (Upstream OE equivalent)
The car started fine and didn’t throw an error at that time.
May 11: Drove to work and car ran great! Felt faster and exhaust note was quieter than ever before!
May 11: Left work and CEL came on.
Control Module Part Number: 8E0 909 559 D
Component and/or Version: JHM* V3/9X G 0003
Software Coding:(###) ###-####
Work Shop Code: WSC 06435
1 Fault Found:
16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit P0130 - 008 - Implausible Signal
May 12: Tested all wiring as recommended. Results are as follows:
ECU pin # B1S1 harness pin # Specified resistance: As tested:
70 (signal) 1 1.5 ohm max. 1.1 ohm
71 (signal) 2 1.5 ohm max. 1.1 ohm
51 (signal) 5 1.5 ohm max. 1.1 ohm
52 (signal) 6 1.5 ohm max. 1.1 ohm
5 (power) 4 1.5 ohm max. 1.1 ohm
44 (ground) 3 1.5 ohm max. 1.1 ohm
No issues found with wiring between ECU and B1 S1 connector.
May 13: Tested voltages at B1 S1 and B2 S1 connectors with ignition ON.
B1 S1 Pin # Specified range: As tested: B2 S1 Pin # Specified range: As tested:
#1 0.400 – 0.500v 2.5v #1 0.400 – 0.500v 2.9v
#2 0.400 – 0.500v 5v #2 0.400 – 0.500v 360mv
#3 0.400 – 0.500v 3.3mv #3 0.400 – 0.500v 3.1mv
#4 0.400 – 0.500v 2.5v #4 0.400 – 0.500v 2.5v
#5 0.400 – 0.500v 2.5v #5 0.400 – 0.500v 2.5v
#6 0.400 – 0.500v 5v #6 0.400 – 0.500v 360mv
No wiring issue found. Voltages are completely wrong on both harnesses from ECU.
In the manual it says to "Test wires 1 to 5 for voltage. Specified rage: 0.400v - 0.500v"
These were with the multi-meter on the negative terminal of the battery and testing each terminal with the positive lead of the multi-meter. I went back and tested pin #1 to pin #5 and saw the correct voltage on B2S1. That side showed a correct value of 0.477v very steadily. After I saw this and realized my mistake, I tested B1S1 the same way and the voltage on B1S1's harness was 2.45v.
I also saw that the voltage between terminals #3 & #4 are showing 14.00v when the car is running so I know that the O2 heating circuit is working properly. B2 is the same as well.
Swapped B2S1 sensor to B1S1 location and B1S1 to B2S1 location.
CEL returned only for B1 S1. B2 S1 still working fine.
Oxygen sensor info:
B1 S1 sensor from 2003 06C906265B
B2 S1 sensor from 2009 1K0998262F (superseded part number)
B1 S1 stays at 5.0V at all times (as measured at pin #2 of harness). B2S1 varies between 1.0 – 1.5V.
It appears that the issue is only on the B1 S1 connection and the values from the ECU are not making any sense to the ECU. The wires have been traced and tested but are completely fine and showing no faults.
Further testing using measuring block 33 showed that when I revved the engine up to 3-4k RPM, the voltage for the B1 S1 started to drop lower than 5.00V and in some cases got as low as 2.9V. The lamba correction was always positive numbers and was as high as 25% correction. B1 S1 still sits between 1.4-1.5V and usually shows negative correction values between -.06 and -.10%.
Submitted: 1 year ago.
Category: Audi
Customer: replied 1 year ago.
Sorry for the sea of information. I can provide some of the wiring data separately if it is hard to read.
Expert:  Wolfgang replied 1 year ago.
Hello there! I'm Wolfgang ! I will try to assist you as much as I can.
ok on your vehicle i do need 2 things
vin #
second in the spare tire area is a white 3x5 sticker i need a photo of that sticker please to get the factory wiring diagrams and assist. thanks
Expert:  Jake replied 1 year ago.
Hello, thank you for requesting me!
Would you still like my assistance?
Thank You!
Jake "The Audi Doctor"
Customer: replied 1 year ago.
Thanks to both of you for replying. I will get the data that Wolfgang requested and post it here later this evening when I'm home from work.
Expert:  Jake replied 1 year ago.
Based on all the information provided I'm going to take a guess here. I think one of the catalysts might be clogged/restricted.
A couple of "indicators" would be, first and easiest would be, the fuel trims in MVB (measuring value block) #32. If the banks are significantly different that's your first clue. By the way, anytime you erase the codes the fuel trims go back to 0%'so you need to check the values after the vehicle has been driven for some time.
Then to verify if you remove the front oxygen sensors and measure the back pressure when someone inside the car snaps the throttle there should be very little pressure maybe 0-1 PSI. If you have more pressure that catalyst is likely plugged. To confirm you can do the same test at the down stream catalyst. Typically the warm up catalyst is the one that plugs. If the pressure is the same the restriction is "downstream".
Let me know how things go.
Thanks!
Jake
Customer: replied 1 year ago.
Jake, this car has no catalysts. That was done when I installed the new downpipes two months ago.For reference purposes, my VIN is: 8E_4A095070. I still need to get a picture of the options code sticker in the tire well. Not sure which PR codes are important in this scenario though.
Customer: replied 1 year ago.
One more thing, on my car, measuring block #32 shows the lambda correction factors for all 4 oxygen sensors. I believe that they are usually all 0.0% at idle.
Expert:  Jake replied 1 year ago.
I realized that may not have catalysts, however those are still valid tests as the mufflers may be restricted.
The trims should be + or - 4%. Anytime you erase any codes trims go back to zero, so you need to drive it for awhile so that the trims can "trim". The longer it's driven the more accurate the values.
Thanks!
Jake
Customer: replied 1 year ago.
Okay. I did go check those values for block #32. All 4 boxes are fixed at 0.0%.I also received a code for the B1S2 sensor and the N80 EVAP valve now.VAG-COM Version: Release 311.2-NControl Module Part Number: 8E0 909 559 D
Component and/or Version: JHM* V3/9X G 0003
Software Coding:(###) ###-#### Work Shop Code: WSC 06435
3 Faults Found:
16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit
P0130 - 008 - Implausible Signal
17522 - Oxygen (Lambda) Sensor: B1 S2: Internal Resistance too High
P1114 - 008 - Implausible Signal - Intermittent
17834 - EVAP Purge Valve (N80): Open Circuit
P1426 - 004 - No Signal/CommunicationI suspect that either there's a wiring fault or the ECU is going bad. I'm trying to make a list of wires to test. As it stands now, I believe that the signal wires for the B1S1 are the main issue, the B1S2 looks like the heater circuit is the issue and the N80 looks like no signal. The car runs and drives so I know the fuel pump relay is good and working. The N80 EVAP code was no happening until now. The Bentley manual says that if the wiring is good, replace the ECU. I've already tested the B1S1 wires and they are fine. I ordered a spare ECU today but I don't know how I will get my immobilizer code into the spare ECU when it arrives.
Expert:  Wolfgang replied 1 year ago.
i do need the pic of that sticker to get the correct wiring diagram to assist
thanks

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