P0138
Low
Powertrain
O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
Common Causes
Failed downstream O2 sensor stuck high
Degraded catalytic converter passing unburned fuel
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Quick Info
| Code | P0138 |
| System | Powertrain |
| Severity | Low |
Disclaimer
This information is for diagnostic guidance only. Always verify repairs with a qualified technician before performing safety-critical work.
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