Catali or oxygen sensor?
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Junior Member
Joined: Jan 2010
Posts: 1
Catali or oxygen sensor?
Hi there,
Can anyone tell me what's wrong? bad oxygen sensor?
Last emission test shows: CO at idle 0.19%(pass) at 2500rpm -3.5%(limit was .7 failed)
HC at idle and 2500rpm passed easily.
Vag shows lambda at iddle and around 2500rpm over one to 18, does it mean it runs lean,right? but emission test shows that it runs rich at 2500rpm..confused.. I have attached VAG screenshots.
Many thanks for any feedback
PS. It's A4 2002 3.0 Quattro
Can anyone tell me what's wrong? bad oxygen sensor?
Last emission test shows: CO at idle 0.19%(pass) at 2500rpm -3.5%(limit was .7 failed)
HC at idle and 2500rpm passed easily.
Vag shows lambda at iddle and around 2500rpm over one to 18, does it mean it runs lean,right? but emission test shows that it runs rich at 2500rpm..confused.. I have attached VAG screenshots.
Many thanks for any feedback
PS. It's A4 2002 3.0 Quattro
3rd Gear
Joined: May 2009
Posts: 1,682
From: South Korea
Well, if you're getting the P0421 code as well is more than likely a the after cat sensor... but really I look at all those numbers and don't mean much to me, try looking phisically at the cat if is hotter than the othe ris the cat. remember you have two on your 3.0...
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