Lack of HO2S Switch — Sensor Indicates Rich (Bank 1)
2009-2012 Ford Flex 3.5L V6 🇨🇦
Description
The upstream heated oxygen sensor on Bank 1 is not switching and indicates a persistent rich condition. The PCM detects the sensor is stuck indicating rich (low oxygen) and has reached its maximum lean correction limit.
Symptoms
- Check Engine Light
- Rich exhaust smell
- Black exhaust smoke
- Poor fuel economy
- Rough idle
- Fouled spark plugs
Common Causes
- Leaking fuel injector Bank 1
- High fuel pressure (faulty regulator)
- Faulty O2 sensor stuck rich
- Saturated charcoal canister (EVAP purge issue)
- Coolant leak into combustion chamber
Diagnostic Steps
- Monitor O2 sensor on scan tool — should oscillate, not stay high
- Check fuel pressure for over-pressure
- Inspect spark plugs for fouling
- Check for leaking injectors
- Inspect for coolant consumption
Repair Notes
Replace O2 sensor if stuck. Check fuel pressure regulator. Inspect for leaking injectors.
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 2009-2012 Ford Flex?
P1132 stands for "Lack of HO2S Switch — Sensor Indicates Rich (Bank 1)". The upstream heated oxygen sensor on Bank 1 is not switching and indicates a persistent rich condition. The PCM detects the sensor is stuck indicating rich (low oxygen) and has reached its maximum lean correction limit.
What are the symptoms of P1132 on a Ford Flex?
Common symptoms of P1132 include: Check Engine Light, Rich exhaust smell, Black exhaust smoke, Poor fuel economy, Rough idle, Fouled spark plugs.
What causes P1132 on a 2009-2012 Ford Flex?
Common causes of P1132 include: Leaking fuel injector Bank 1, High fuel pressure (faulty regulator), Faulty O2 sensor stuck rich, Saturated charcoal canister (EVAP purge issue), Coolant leak into combustion chamber.