Severity: Low
Safe to drive. Schedule a diagnosis soon.
What P0133 means
The upstream bank 1 O2 sensor is switching too slowly.
Symptoms
- Possibly poor economy
Common causes
Most likely first
- 1Aged O2 sensor
- 2Exhaust leak
- 3Contamination from coolant or oil burning
How we diagnose it
- Watch sensor switching in live data
- Check for exhaust leaks
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.