OBD-II code guide
P0153 Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1
P0153 means the upstream oxygen sensor on bank 2 is responding slower than expected.
What it means
The bank 2 upstream sensor may be too slow for accurate fuel mixture control.
Common symptoms
- Check engine light
- Poor fuel economy
- Emissions failure
- Usually mild symptoms
- Possible hesitation
Likely causes
- Aging oxygen sensor
- Exhaust leak
- Sensor contamination
- Wiring resistance
- Fuel mixture issue
First checks
- Confirm bank 2 sensor 1 location.
- Inspect exhaust leaks.
- Review live sensor response.
- Check for oil or coolant contamination clues.