Powertrain
generic / SAE
P0143
O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
The ECU detects a general electrical fault on the third oxygen sensor in the bank 1 exhaust path (typically located after a second catalyst on diesel or large engines with multi-cat exhausts).
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 43
Possible causes
- Sensor aged or failed high
- Sensor wiring open or shorted medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: easy
- DIY: possible
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References
sae:J2012