ford escort 2001

codes only go up to 0900 something and my code reads 1131

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  1. P1131 Lack Of HO2S11 Switch – Sensor Indicates Lean

    Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

    Reference Link:

    Possible causes
    – Faulty Oxygen Sensor
    – Vacuum leak affecting bank 1 only
    – Fuel injector problem bank 1
    – Check for cylinder misfire on bank 1
    – Engine mechanical condition

    Tech notes
    Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.
    A Heated Exhaust Oxygen (HO2S) sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

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