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Registered
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3,560 Posts
Discussion Starter #1
my car has a cel.
its for the exhaust (p0420??)
i replaced the upper o2 off of advice from a freind and reset ecm. cel came back on. car has 120,000 miles on it. anything else to look for?
its driving me nuts.
 

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Token Engin-nerd
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3,414 Posts
yeah either the REAR sensor is toast or the cat is dead.

i did end up finding my good rear sensor if you still want it.
 

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Registered
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3,560 Posts
Discussion Starter #4
ok i'll give that a shot.
 

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C2H5OH
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11,867 Posts
well being you replaced the wrong one, just swap the old sensor with the crappy sensor. maybe a cheap fix.
IIRC they interchange
 

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Token Engin-nerd
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3,414 Posts
you cant swap front to back they are different connectors.
 
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