Need help with P1131 code
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Junior User
Joined: Feb 2002
Posts: 53
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From: Hurdle Mills , NC
Need help with P1131 code
Hope somebody can help me, unlike AutoZono...
Had free code read after "Service Engine Soon" light came on at AZ. After searching forums, I replaced the O2 sensor on the driver's side, before the Cat. After a week of driving, the "LIGHT" is on, again...FUEL AIR METERING, misfire on bank 1, problem, again...they give me a list of possible causes...EGR pressure regulator, fuel injector pressure regulator, two more O2 sensors (they said I had 3 before the CAT) but that's crap, as I have one only on each manifold.
And lastly, maybe a vacuum leak...any help will be GREATLY appreciated, guys !!! Thanks in advance !!!!! Mike in NC
99 Expy EB 5.4
Had free code read after "Service Engine Soon" light came on at AZ. After searching forums, I replaced the O2 sensor on the driver's side, before the Cat. After a week of driving, the "LIGHT" is on, again...FUEL AIR METERING, misfire on bank 1, problem, again...they give me a list of possible causes...EGR pressure regulator, fuel injector pressure regulator, two more O2 sensors (they said I had 3 before the CAT) but that's crap, as I have one only on each manifold.
And lastly, maybe a vacuum leak...any help will be GREATLY appreciated, guys !!! Thanks in advance !!!!! Mike in NC
99 Expy EB 5.4
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
Swap your right and left o2 sensor, if the problem moves, you need to replace the old one. It's usually a good idea to replace both front sensors at the same time, if one is failing the other is not far behind.
I'd also check for vacuum leaks.
Swap your right and left o2 sensor, if the problem moves, you need to replace the old one. It's usually a good idea to replace both front sensors at the same time, if one is failing the other is not far behind.
I'd also check for vacuum leaks.
