Front Oxygen A/F Sensor Range/Performance Problem
2012-2016 Subaru Impreza 2.0L H4
Description
The PCM has detected that the front air-fuel ratio sensor is not performing within the expected range. The sensor output does not correctly correspond to the actual air-fuel ratio, affecting closed-loop fuel control accuracy.
Symptoms
- Check Engine Light
- Poor fuel economy
- Rough idle
- Hesitation on acceleration
- Failed emissions test
Common Causes
- Contaminated A/F sensor from oil or coolant
- Aging A/F sensor with degraded performance
- Exhaust leak near sensor
- Fuel quality issue affecting sensor
- Incorrect sensor installed
Diagnostic Steps
- Monitor A/F sensor output on scan tool during various conditions
- Check A/F sensor heater operation
- Inspect for exhaust leaks near sensor
- Check for oil or coolant contamination in exhaust
- Compare sensor readings to known good values
Repair Notes
Replace the front A/F sensor if its output does not match the expected range during testing.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1137 on Other Vehicles
Common Questions
What does code P1137 mean on a 2012-2016 Subaru Impreza?
P1137 stands for "Front Oxygen A/F Sensor Range/Performance Problem". The PCM has detected that the front air-fuel ratio sensor is not performing within the expected range. The sensor output does not correctly correspond to the actual air-fuel ratio, affecting closed-loop fuel control accuracy.
What are the symptoms of P1137 on a Subaru Impreza?
Common symptoms of P1137 include: Check Engine Light, Poor fuel economy, Rough idle, Hesitation on acceleration, Failed emissions test.
What causes P1137 on a 2012-2016 Subaru Impreza?
Common causes of P1137 include: Contaminated A/F sensor from oil or coolant, Aging A/F sensor with degraded performance, Exhaust leak near sensor, Fuel quality issue affecting sensor, Incorrect sensor installed.