P1127 - Exhaust Not Warm Enough, Downstream Sensor Not Tested
P1127 Possible Causes
- Faulty O2 Sensor Heaters
- O2 Sensor Heaters harness is open or shorted
- O2 Sensor Heaters circuit poor electrical connection
How do I fix code P1127?Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
Cost of diagnosing the P1127 code
Labor: 1.0The cost of diagnosing the P1127 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
P1127 MeaningThe 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.
P1127 More InformationNeed more information on how to fix the P1127 code?
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Information for specific makes
- P1127 AUDI Long Term Fuel Trim B1 System Too Rich
- P1127 FORD Exhaust Not Warm Enough Downstream O2 Sensor Not Tested
- P1127 HYUNDAI Long Term Fuel Trim Error System Rich
- P1127 LEXUS ECTS Actuator Power Source Circuit Malfunction
- P1127 LINCOLN Exhaust Not Warm Enough Downstream O2 Sensor Not Tested
- P1127 MERCURY Exhaust Not Warm Enough Downstream O2 Sensor Not Tested
- P1127 TOYOTA ETCS Actuator Power Source Circuit Malfunction
- P1127 VOLKSWAGEN Long Term Fuel Trim B1 System Too Rich