Replace O2 sensors. Better Idle
Thread Starter
Instructor
Joined: May 2014
Posts: 106
Likes: 0
From: Miami FL
Replace O2 sensors. Better Idle
So I installed LG street headers and Borla stingers. Took the car to the dyno and found out by my tuner that the ECU wasn't reading the O2 sensors so the tuner could only tune the car for wide open throttle. I then went to autozone and bought myself two new rear O2 sensors and installed them myself. I am only using two sensors because with the LG headers you only need two and I am using the rear sensors plugged into the front sensor clips via a harness that came with my headers. Now after having new sensors installed and getting a street tune the car drives like heaven. Before even when my car was completely stock the car drove perfectly fine but while idling I could feel the engine do a little shake every two seconds or so. Now that issue is completely resolved. I'm not saying it was a big issue, all I am saying is maybe you guys wanna purchase some new O2 sensors. It makes the car drive a whole lot nicer. My car had 80,000 miles when I replaced the sensors. Food for thought.
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
I gots me a bone stock 04 A6....mine also does a little shake/burp at idle at times. I don't have a tech 2 so I can't really tell if the O2's are to blame but it might be worth a shot to change them out....trouble is I'd have to buy 4 of them !
Thread Starter
Instructor
Joined: May 2014
Posts: 106
Likes: 0
From: Miami FL
Yes there are four O2 sensors but the important ones to change are the fronts. They are the ones that actually read air fuel ratios that tell the computer how much fuel to give. The rear O2 sensors job is to read aif fuel ratios after the cats to make sure the cats are working well. The rear ones do not tell the computer to change air fuel ratio. Hope this helps you.
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
Yes there are four O2 sensors but the important ones to change are the fronts. They are the ones that actually read air fuel ratios that tell the computer how much fuel to give. The rear O2 sensors job is to read aif fuel ratios after the cats to make sure the cats are working well. The rear ones do not tell the computer to change air fuel ratio. Hope this helps you.
