P0138
O2 Sensor Circuit High Voltage Bank 1 Sensor 2
P0138 is an OBD-II diagnostic trouble code meaning: O2 Sensor Circuit High Voltage Bank 1 Sensor 2. Common causes: oxygen sensor malfunction (bank 1 sensor 2), damage to the sensor wiring harness. Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Unstable engine operation
- Check Engine Light Is On
- Reduced catalytic converter efficiency
Causes
- Oxygen sensor malfunction (Bank 1 Sensor 2)
- Damage to the sensor wiring harness
- Short circuit in the sensor circuit
- Exhaust leaks
- Fuel system problems (mixture too rich)
How to Fix
- Check the sensor wiring harness for damage.
- Check sensor connections and connectors
- Check the voltage in the sensor circuit
- Replace the oxygen sensor if necessary
- Check the exhaust system for leaks
Related codes
Error P0138 by Vehicle Brand
FAQ
What does the P0138 code mean?
P0138 is an OBD-II diagnostic trouble code that indicates: O2 Sensor Circuit High Voltage Bank 1 Sensor 2
What causes a P0138 error code?
The most common causes of P0138 include: Oxygen sensor malfunction (Bank 1 Sensor 2); Damage to the sensor wiring harness; Short circuit in the sensor circuit; Exhaust leaks.
How do I fix a P0138 diagnostic trouble code?
To fix P0138: Check the sensor wiring harness for damage.. Check sensor connections and connectors. Check the voltage in the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0138?
Limited driving only, diagnose soon
How much does it cost to fix P0138?
The estimated repair cost for P0138 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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