Powertrain
generic / SAE
P0158
O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
The ECU detects abnormally low voltage from the downstream O2 sensor on bank 2 (alternate definition mapping in some manufacturers' interpretation). Indicates persistent lean reading, open sensor or wiring shorted to ground.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 58
Possible causes
- Lean condition on bank 2 high
- O2 sensor failed medium
- Connector pins corroded - high contact resistance low
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