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O2 sensor...

E

erik671

Member
Joined
May 10, 2001
Messages
21
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City, State
Pepperell, MA
Year, Model & Trim Level
'96 XLT
Can an O2 sensor before the cat cause a P0420 code? Or is it *only* the downstream O2 sensor that can cause that code? (assuming that cat is fine...)

-Erik
 






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