DTC P1127: Exhaust Not Warm Enough, Downstream Sensor Not Tested
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
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 below normal operating temperature. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | - | GO to Pinpoint Test DW . | - |