P0154
PowertrainOxygen Sensormoderate severityO2 Sensor Circuit No Activity Bank 2 Sensor 1
What P0154 Means
No switching activity from the upstream O2 sensor on Bank 2.
Symptoms
- Check Engine Light
- Poor fuel economy
Common Causes
- Faulty sensor
- Heater failure
- Wiring open
Diagnostic Steps
- Test sensor signal
- Check heater
- Inspect wiring
Where to start: Replace O2 sensor.
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