P1272
Air Fuel Ratio Sensor 1 Bank 1 Circuit No Activity Detected
P1272 is an OBD-II diagnostic trouble code meaning: Air Fuel Ratio Sensor 1 Bank 1 Circuit No Activity Detected. Common causes: air-fuel ratio sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $33–167.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Unstable engine idling
- The car may go into emergency mode
Causes
- Air-fuel ratio sensor malfunction
- Open or short circuit in the sensor circuit
- Poor connection or corrosion in connectors
- Engine control unit (ECU) malfunction
- Problems with power or grounding of the sensor
How to Fix
- Check the integrity of the sensor circuit (breaks, short circuits)
- Inspect the sensor connectors for corrosion or damage.
- Check the power supply and grounding of the sensor
- Replace faulty air-fuel ratio sensor
- If necessary, reflash or replace the engine control unit
Related codes
Error P1272 by Vehicle Brand
FAQ
What does the P1272 code mean?
P1272 is an OBD-II diagnostic trouble code that indicates: Air Fuel Ratio Sensor 1 Bank 1 Circuit No Activity Detected
What causes a P1272 error code?
The most common causes of P1272 include: Air-fuel ratio sensor malfunction; Open or short circuit in the sensor circuit; Poor connection or corrosion in connectors; Engine control unit (ECU) malfunction.
How do I fix a P1272 diagnostic trouble code?
To fix P1272: Check the integrity of the sensor circuit (breaks, short circuits). Inspect the sensor connectors for corrosion or damage.. Check the power supply and grounding of the sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1272?
Limited driving only, diagnose soon
How much does it cost to fix P1272?
The estimated repair cost for P1272 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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