HO2S Bank 1 Sensor 1 Air/Fuel Ratio Too Rich
2014-2021 Mazda Mazda6 2.5L I4
Description
The upstream heated oxygen sensor on Bank 1 indicates a persistent rich air-fuel ratio. The PCM fuel trim correction has reached its maximum lean limit but cannot correct the rich condition.
Symptoms
- Check Engine Light
- Rich exhaust smell
- Black exhaust smoke
- Poor fuel economy
- Fouled spark plugs
Common Causes
- Leaking fuel injector
- High fuel pressure from faulty regulator
- Faulty O2 sensor reading rich incorrectly
- EVAP purge valve stuck open
- Coolant entering combustion chamber
Diagnostic Steps
- Monitor fuel trim values on scan tool
- Check fuel pressure with gauge
- Inspect spark plugs for rich fouling
- Test for leaking injectors
- Check EVAP purge valve operation
Repair Notes
Correct the source of the rich condition; check fuel pressure, injectors, and the O2 sensor.
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
P1132 on Other Vehicles
Common Questions
What does code P1132 mean on a 2014-2021 Mazda Mazda6?
P1132 stands for "HO2S Bank 1 Sensor 1 Air/Fuel Ratio Too Rich". The upstream heated oxygen sensor on Bank 1 indicates a persistent rich air-fuel ratio. The PCM fuel trim correction has reached its maximum lean limit but cannot correct the rich condition.
What are the symptoms of P1132 on a Mazda Mazda6?
Common symptoms of P1132 include: Check Engine Light, Rich exhaust smell, Black exhaust smoke, Poor fuel economy, Fouled spark plugs.
What causes P1132 on a 2014-2021 Mazda Mazda6?
Common causes of P1132 include: Leaking fuel injector, High fuel pressure from faulty regulator, Faulty O2 sensor reading rich incorrectly, EVAP purge valve stuck open, Coolant entering combustion chamber.