P2196 – O2 Sensor Signal Stuck Rich (Bank 1 Sensor 1)
Description
The ECM detects the upstream O2 sensor stuck rich on Bank 1.
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Compare Diagnostic ScannersSymptoms
- Rough idle
- Poor fuel economy
- Black smoke
- Hesitation
Causes
- Faulty O2 sensor
- Leaking injector
- Fuel pressure regulator fault
- ECM fault
Diagnosis
- Monitor O2 data
- Check fuel trims
- Inspect injectors
- Test fuel pressure
Repair
- Replace O2 sensor
- Repair injector
- Replace regulator
- Replace ECM