OBD-II TROUBLE CODE GUIDE
P0133: Oxygen Sensor Circuit Slow Response — Bank 1 Sensor 1
The upstream oxygen sensor is responding more slowly than expected.
What P0133 means
The upstream oxygen sensor is responding more slowly than expected.
Common possible causes
- Aging oxygen sensor
- Exhaust leak before the sensor
- Fuel-mixture problem or damaged wiring
What to check first
Record all stored and pending codes and freeze-frame data before clearing anything. Inspect relevant wiring, connectors, hoses, fluid levels, and obvious damage. Use vehicle-specific service information and test the affected system before purchasing parts.
A code is not a parts order. Several faults can create the same code, and replacing the component named in a code description may not correct the underlying problem.
Look up P0133 for my vehicle