OBD-II Code · Sensors
P2231
HO2S Signal Circuit Shorted to Heater Circuit (B1S1)
medium severitySafe to drive$150-$400
O2 signal wire is shorted to heater wire inside the sensor or harness.
Common symptoms
- CEL
- Erratic O2 readings
Likely causes
- Sensor internal short
- Damaged harness
- Pinched wire
Where to start
- Try the cheapest cause first. Start by checking: sensor internal short.
- 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.
Related codes
P0176Flex Fuel Composition Sensor CircuitP0177Flex Fuel Composition Sensor RangeP0178Flex Fuel Composition Sensor Low InputP0179Flex Fuel Composition Sensor High InputP0130O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)P0131O2 Sensor Circuit Low Voltage (B1S1)P0132O2 Sensor Circuit High Voltage (B1S1)P0133O2 Sensor Slow Response (B1S1)
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