P1133 – O2 Sensor Slow Response (Bank 1 Sensor 1)
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Symptoms
- Rough idle
- Hesitation
- Poor acceleration
- High fuel trims
- Check engine light
Causes
- Aging O2 sensor
- Exhaust leak
- Vacuum leak
- Contaminated sensor
- Wiring issue
Diagnosis
- Inspect O2 wiring
- Check fuel trims
- Inspect exhaust leaks
- Scan live data
- Test sensor response
Repair
- Replace O2 sensor
- Fix exhaust leaks
- Fix vacuum leaks
- Repair wiring
- Check fuel trims