Question about 1999 Ford F150 Regular Cab
P1131-Lack of HO2S-21 Switch, Sensor Indicates Lean- Bank 1
A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
A code P1131 may mean that one or more of the following has happened:
Leaking/contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system
Posted on Jun 05, 2009
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Posted on Jan 02, 2017
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