2000 Audi A6 How to change Bank 2 Sensor 1 O2 sensor?

KEVINMK2

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2000 AUDI A6
6 CYL
4WD
AUTOMATIC
89,000 MILES

Hi. I have a 2000 Audi A6 Quattro with 2.8L engine, got a P0154 error code stating "O2 sensor circuit no activity detected". This code has come and gone on its own, and I'm trying to replace the sensor to fix it. Would you please kindly tell me how to access the O2 sensor and what special tools are needed?

Just some additional information, not sure if it helps:
symptoms: I know this sounds voodoo, but the code seems to come on when its raining and sometimes goes away after it rains. The car experiences rough idle in drive and neutral with RPMs wanting to drop below 600 instead of staying at 700 when the code comes on.
milage: 89000
repairs: changed battery, not changed time belt.

Thanks in advance!

8 Replies

IMPALASS

MECHANIC
3,112 POSTS

Hello

To better assist you is your model just the A6 or the Quattro or the Avant Quattro.

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Saturday, October 17th, 2009 AT 7:05 PM

KEVINMK2

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My car is an Avant Quattro. Much appreciate if you could provide relevant pictures or diagram for the fix.

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Saturday, October 17th, 2009 AT 7:18 PM

IMPALASS

MECHANIC
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Hello

Okay, you have 4 sensors on the vehicle. Here are the banks below.

Cylinder bank 1 is located on right side in direction of travel.
Cylinder bank 2 is located on left side in direction of travel.

Since your code is Bank 2 Sensor 1 that would be number 15 the one before the cat.

You are supposed to follow the directions below using the grease. You may have to get this at the dealer.

1. Heated Oxygen Sensor (HO2S) 2 - G108-* bank 2, 50 Nm
Only use "G 052 112 A3" to grease thread; do not let "G 052 112 A3" get onto slit of oxygen sensor

You will need to use a special tool you can get it at Auto Zone and you may be able to use their tool check out program if they have that to loan.

Try cleaning your MAF sensor with electrical cleaner. Just spray it really good. . .the resistors and the fine wire. don't touch it otherwise. just the spray.

Then let's see how it runs

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Saturday, October 17th, 2009 AT 8:35 PM

IMPALASS

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Hello -

Also, it looks like you may have some recalls on your vehicle. The dealer may fix these for free. Please contact the dealer service department, give them the VIN number of your car and have them check on these to see if they apply to you.

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Saturday, October 17th, 2009 AT 8:41 PM

KEVINMK2

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Thanks for the prompt reply. I was wondering if you could post slightly larger pic for the 1st diagram? I can hardly see a thing there. Also, mind kindly pointing out where the MAF sensor's location in this engine bay?

Thanks!

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Saturday, October 24th, 2009 AT 12:28 PM

IMPALASS

MECHANIC
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Hello -

Sure -I will do what I can to blow it up but have you tried right clicking on the pic. . ..saving it to your drive then viewing it as a pic or inserting into a say, powerpoint doc and making it bigger?

I have tried several different things but I think that is the best I can do for some reason on that one.

If you need it bigger than this. . .. . ..and the above doesn't work - I will have to fax it to you or split the pic. . .. . ...

Just let me know.

The MAF is located on the aircleaner. . .. . .. . ...

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Sunday, October 25th, 2009 AT 7:39 PM

KEVINMK2

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Thank you Sir! That's very helpful indeed!
I've cleaned the MAF sensor with air intake and since it isn't raining lately all seems well. Crossing fingers that the dreaded check engine light doesn't come on for a long while.

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Sunday, October 25th, 2009 AT 11:25 PM

IMPALASS