Powertrain
generic / SAE
P0159
O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
The ECU detects an abnormally high voltage from the downstream O2 sensor on bank 2. Indicates persistently rich exhaust past the cat, shorted sensor or wiring shorted to voltage.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 59
Possible causes
- Rich condition on bank 2 high
- Signal wire shorted to voltage 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
- Estimated cost: 80–350 €
- Estimated time: 0.3–1.5 h
- Component: oxygen sensor b2s2
- Component: oxygen sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012