02 A6 2.7t o2 sensor replacement.
 

Looking for a DIY post for a 02 A6 2.7t o2 sensor replacement.

its on the exhaust. unplug the connector, wrench the sensor off and replace it. if its hard to get off spay it with wd40.

p.s. if you have an o2sensor code replacing it is not always the answer.

If it were only that easy....

There are 4 of them...

B1S1 is on the pass side front, removed the air tube coming out of the air box.
B1S1 is on the pass side rear, accessible under the car
B2S1 is on the driver side front. Accessible from on top, its the hardest one to get to. I used a really long extenstion and get at it from the passenger side.
B2S2 is on the driver side rear. Under the car

today I pull codes p1458 exhaust gas temp sensor-- short to ground.
p1131 and p1113 both pre cat 02 sensors-- internal resistance too high

I have been pulling the 02 sensor codes for a while and I just cleared the misfire codes I was getting by changing the plugs. What exactly does internal resistance too high mean and how is it effecting performance. Also, there is a chance that the EGT sensor is related to the 02 sensor problem (improper air/fuel mixture) but a short to ground doesn't sound like a voltage implausible code. When I accelerate hard I feel a stuttering that I believe is related to the EGT sensor (the spikes tell the ecu to retard the timing). What do you guys think? Replace both 02's and or EGT sensor?

p.s. im only seeing a short for 1 EGT but it makes sense to replace both right

Same Exact Problem on Same car
 

Hey jhuffman,

I know this is an old topic and post, but if you're still following this thread, I would love to know if you ever figured out the problem you were having. My car just started stuttering like you said and I'm getting all the same codes with misfires in cyl 1-5. THIS SUCKS!! Any suggestions?

Considering replacing all 6 coils, and maybe both pre-cat O2 sensors. Not sure if this is the best plan.

Thanks

dont replace the coils they usually dont go bad. it probably is an ignition control module. there are two of them and they are located on the top of the airbox. buy one of them and swap it back and forth with the new one until your car runs better. called and icm for short should be a 10 min job. ( o and make sure you use the electrode grease that comes with it or it may short the new one pretty quick.:D

ps here is what it looks like http://cgi.ebay.com/ebaymotors/AUDI-...#ht_3212wt_939