P1152 – O2 Sensor Rich Shift (Bank 1 Sensor 1)
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Symptoms
- Rough idle
- Hesitation
- Poor acceleration
- Black smoke
- Check engine light
Causes
- Rich mixture
- Faulty O2 sensor
- Injector leak
- Wiring issue
- ECU issue
Diagnosis
- Inspect O2 wiring
- Check fuel trims
- Inspect injectors
- Scan live data
- Test sensor response
Repair
- Replace O2 sensor
- Fix injectors
- Repair wiring
- Address rich mixture
- Update ECU