Indice dei codici guasto · medium
P0133
HO2 Sensor sense circuit slow response – bank 1, upstream (1/1)
HO2 Sensor sense circuit slow response – bank 1, upstream (1/1)
Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): EMS EOBD, EMS OBD II · Factory MIL flag: 2 · Default action: ECM Default: –Bank 1 closed loop fuel metering inhibited –Canister purge inhibited
Common causes
- Engine misfire HO2 Sensor 1/1 disconnected HO2 Sensor 1/1 mechanical damage HO2 Sensor 1/1 to ECM wiring fault HO2 Sensor 1/1 short circuit to ground HO2 Sensor 1/1 to ECM wiring shield open circuit HO2 Sensor 1/1 heater circuit fault Exhaust leak Low exhaust temperature Injector flow partially blocked Catalyst efficiency decrease HO2 Sensor 1/1 failure
- O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
Quick checks
- Confirm freeze-frame and conditions when the code set
- Inspect connectors, grounds, and harness for the circuit named in the code
- Compare live sensor values vs expected (unplugged/biased sensors are common)
- Check intake boots, PCV, and vacuum lines for splits (very common on aged X-Types)
- Swap coil/plug to another cylinder if misfire is cylinder-specific
Typical fixes
- Replace O2 sensor
- check exhaust leaks