Help with engine service code
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New User
Joined: Dec 2003
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From: carencro,LA
Help with engine service code
the check engine light came on after installing a set of headers,K&N filter and new exhaust. I had the code pulled and it is P1131. Autozone gave me a printout showing it's an O2 sensor on bank 1. What side of the engine is bank 1? I don't have a scanner (fixin to buy one) handy, so any help you can give is great
2000 expedition w/5.4
2000 expedition w/5.4
Elder User
Joined: Sep 2006
Posts: 871
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Bank 1 is the same side as cylinder #1.. typically the passenger side.
If, however, it started setting this code immediately following the work you mentioned, I wouldn't be so quick to assume the oxygen sensor is dead.
A large vacuum leak or biased MAF sensor can sometimes make the sensor appear dead.. when actually it's just reading at the minimum voltage.
Also check and make sure you didn't leave anything unplugged.
Good luck
If, however, it started setting this code immediately following the work you mentioned, I wouldn't be so quick to assume the oxygen sensor is dead.
A large vacuum leak or biased MAF sensor can sometimes make the sensor appear dead.. when actually it's just reading at the minimum voltage.
Also check and make sure you didn't leave anything unplugged.
Good luck
