OBD-II Code · Sensors
P0158
O2 Sensor High Voltage (B2S2)
low severitySafe to drive$150-$400
Bank 2 downstream voltage high.
Common symptoms
- CEL
Likely causes
- Failed sensor
- Short to power
Where to start
- Try the cheapest cause first. Start by checking: failed sensor.
- Cost & scope. $150-$400
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
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