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Old 01-29-2007, 03:10 AM
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Join Date: Oct 2001
Posts: 226
P1137? After Cat Oxygen Sensor?

Have recieved a code p1137 twice. Does this indicate the after-cat oxygen needs to be replaced? There has been no difference in the performance of the car. What exactly does the after-cat sensor do? What kind of effect does it have on performance and driveability.

Somebody said a bad gas cap can cause a p1137?


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Old 01-29-2007, 05:39 AM
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Location: Florida / N.H.
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Shorted 02 sensor.
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Old 01-29-2007, 08:41 AM
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Location: Tucker, Ga USA
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The after-cat O2 sensor has but 2 jobs! Main job 99%, is to monitor the catalyst. The other job is to help with fuel mixture adjustment IF the front O2 sensor is not working at ALL.
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Old 01-29-2007, 04:59 PM
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By getting the p1137 does it mean that only the sensor is bad and not the catalyst? In other words, a bad catalyst would result in a separate code? Thanks again.

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