P1196 – O2 Sensor Heater Circuit Low (Bank 1 Sensor 2)
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Symptoms
- Rough idle
- Hesitation
- Poor acceleration
- High fuel trims
- Check engine light
Causes
- Faulty heater circuit
- Wiring issue
- Blown fuse
- Connector problem
- ECU issue
Diagnosis
- Inspect O2 wiring
- Check heater fuse
- Test sensor resistance
- Inspect connectors
- Scan live data
Repair
- Replace O2 sensor
- Replace fuse
- Repair wiring
- Fix connectors
- Update ECU