P1138
Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
P1138 is an OBD-II diagnostic trouble code meaning: Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich. Common causes: malfunction of the oxygen sensor bank 1 sensor 2, open or short circuit in the sensor circuit. Estimated repair cost: $28–89.
Symptoms
- Increased fuel consumption
- Unstable engine operation at idle
- Check Engine light comes on
- Reduced engine power
- Black smoke from the exhaust pipe
Causes
- Malfunction of the oxygen sensor bank 1 sensor 2
- Open or short circuit in the sensor circuit
- Fuel system problems (mixture too rich)
- Sensor contamination due to oil or coolant leak
- Malfunction of the catalytic converter
How to Fix
- Check the condition of the oxygen sensor bank 1 sensor 2
- Check the continuity of the sensor circuit and connectors
- Check the fuel system for leaks
- Clean or replace the oxygen sensor
- Check the condition of the catalytic converter
Related codes
Error P1138 by Vehicle Brand
FAQ
What does the P1138 code mean?
P1138 is an OBD-II diagnostic trouble code that indicates: Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 Switch Indicates Rich
What causes a P1138 error code?
The most common causes of P1138 include: Malfunction of the oxygen sensor bank 1 sensor 2; Open or short circuit in the sensor circuit; Fuel system problems (mixture too rich); Sensor contamination due to oil or coolant leak.
How do I fix a P1138 diagnostic trouble code?
To fix P1138: Check the condition of the oxygen sensor bank 1 sensor 2. Check the continuity of the sensor circuit and connectors. Check the fuel system for leaks. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1138?
Yes, but get it checked soon
How much does it cost to fix P1138?
The estimated repair cost for P1138 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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