O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 2
Post-cat O2 sensor on bank 2 responds too slowly when mixture transitions from rich to lean. Sensor aging or contamination.
Affected components
- Oxygen sensor b2s2
Common causes
- High likelihood: Sensor aged
Possible symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.