Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1)
Our emissions expert has put together the following information about the P0133 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
- OBD II P0133
Fault Code Definition
Code P0133 is triggered when the Oxygen Sensor rate of signal change that is sent to the Powertrain Control Module is too slow in relation to the input from other primary sensors, such as the Throttle Position Sensor.
Symptoms
- Check Engine Light will illuminate
- In many cases, no abnormal symptoms may be noticed
- In some cases, the vehicle may get poor fuel mileage
- In some cases, the engine may hesitate during acceleration
Common Problems That Trigger the P0133 Code
- Defective Oxygen Sensor
- Faulty Oxygen Sensor wiring or connections
- Exhaust System leaks near the Oxygen Sensor
Common Misdiagnoses
- Oxygen Sensor Sensor is replaced when the real problem is a poor connection or chafed wiring
- Oxygen Sensor is replaced when the real problem is a vacuum leak
- Oxygen Sensor is replaced when the problem is an exhaust leak