P0153
PowertrainOxygen Sensormoderate severityO2 Sensor Circuit Slow Response Bank 2 Sensor 1
What P0153 Means
The upstream O2 sensor on Bank 2 is responding too slowly.
Symptoms
- Check Engine Light
- Poor fuel economy
- Failed emissions
Common Causes
- Aging sensor
- Contaminated sensor
- Exhaust leak
Diagnostic Steps
- Monitor switching rate
- Check for leaks
- Test response time
Where to start: Replace O2 sensor.
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