Code P1131 - Which O2 sensor is bad?
Posting Guru
Joined: Apr 2003
Posts: 1,089
Likes: 1
From: Michigan
Originally Posted by SZAlbNM
Lack of heated upstream oxygen sensor, bank 1. Does upstream mean before the cat? I'm trying to pinpoint which one is bad. Thanks
DTC P1131 - lack of HO2S-11 switches, sensor indicates lean (bank 1, sensor 1). This is the upstream sensor on the passenger side cylinder bank before the cat. How many miles on the veh?. Possibly it is the sensor itself, but it might not be. You need to have someone go in and look at the actual data being provided by the sensor. O2 sensors "switch" from low volts (.1v) to high volts (1v) indicating the oxygen content of the exhaust. A sensor that is operating properly and is stuck "lean" or at a low voltage is indicating a high oxygen content in the exhaust. This could be the sign of a vacuum leak, or other things. My point is, just don't assume that it is the sensor that is bad (it could be). If you want to spend some money go ahead and replace it, if the DTC goes away, you've found the problem. If it doesn't, you'll have to look elsewhere.
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Junior User
Joined: Jul 2004
Posts: 74
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From: Albuquerque,NM
rlh68050,
Thanks for the quick reply. Its a 2000 with 5.4L and 89,000 miles. I looked at the print out again and it is also throwing code P1132 and P0171 in addition to P1131.
Thanks for the quick reply. Its a 2000 with 5.4L and 89,000 miles. I looked at the print out again and it is also throwing code P1132 and P0171 in addition to P1131.
Posting Guru
Joined: Apr 2003
Posts: 1,089
Likes: 1
From: Michigan
Originally Posted by SZAlbNM
rlh68050,
Thanks for the quick reply. Its a 2000 with 5.4L and 89,000 miles. I looked at the print out again and it is also throwing code P1132 and P0171 in addition to P1131.
Thanks for the quick reply. Its a 2000 with 5.4L and 89,000 miles. I looked at the print out again and it is also throwing code P1132 and P0171 in addition to P1131.
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