P0159low severityPowertrain
O2 Sensor Circuit Slow Response Bank 2 Sensor 2
on 1996 Toyota 4Runner 2.7L I4 · 4WD
What this code means
Slow response from the downstream O2 sensor on Bank 2.
Symptoms
- Check Engine Light
- Failed emissions
Common causes
- Aging sensor
- Contaminated sensor
Diagnostic steps
- Monitor response
- Test sensor
Repair notes
Replace sensor.
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