DTC P1127: Exhaust Not Warm Enough, Downstream Sensor Not Tested
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P1127 - EXHAUST NOT WARM ENOUGH, DOWNSTREAM SENSOR NOT TESTED
| Description: | The heated oxygen sensor (HO2S) monitor uses an exhaust temperature model to determine when the HO2S heaters are cycled ON. The test fails when the inferred exhaust temperature is below a minimum calibrated value. | ||
| Possible Causes: |
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| Diagnostic Aids: | Monitor the HO2S heater PIDs to determine their ON/OFF state. DTC P1127 is present if the exhaust is not hot. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | - | GO to H: Fuel Control STEP H59. | - |