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check engine light came on run for a few days and all of a sudden the light goes out. Put my obd2 instrument on it and got a reading P1131 indicating a lack of HO2S11 switches- sensor indicates lean. can you tell me what may cause the light to come on. The car is 1997 Mercury Tracer.

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Q: P1131 code switch sensor indicates lean how do you fix it?
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