P0158moderate severityPowertrain
O2 Sensor Circuit High Voltage Bank 2 Sensor 2
on 2019 Mazda Mazda3 2.5L I4 · FWD
What this code means
High voltage from the downstream O2 sensor on Bank 2.
Symptoms
- Check Engine Light
- May indicate catalyst failure
Common causes
- Faulty sensor
- Catalyst failure
- Rich condition
Diagnostic steps
- Test voltage
- Check catalyst
Repair notes
Replace sensor or catalyst.
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