P0143low severityPowertrain
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The third oxygen sensor on bank 1 is reading a low voltage. This usually means a lean condition or a wiring short.
Symptoms
- Check engine light on
- Failed emissions test
- Poor fuel economy
Common causes
- Short to ground in wiring
- Faulty oxygen sensor
- Exhaust leak
- Corroded connector
Diagnostic steps
- Read O2 sensor voltage with scan tool
- Inspect wiring for shorts to ground
- Check for exhaust leaks
- Replace sensor if faulty
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