P0133 on BMW — O2 Sensor Circuit Slow Response, Bank 1 Sensor 1
BMW
Verified1 source
1 source
- Official data (NHTSA)official_feed
What P0133 means
Caution — monitor closely
The front oxygen sensor responds to mixture changes slower than normal — an aging or contaminated sensor.
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Aging front oxygen sensor
What to check first
- Check sensor response time with a scan tool
- Inspect sensor for contamination
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