P1138 MINI Code - O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 2
Quick Answer
The P1138 MINI code indicates a problem with the O2 sensor heater circuit in Bank 1 Sensor 2. Common causes include Faulty O2 sensor heater circuit, Wiring or connector issues in the heater circuit, Blown fuse related to the O2 sensor heater. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1138 MINI indicates O2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty O2 sensor heater circuit, Wiring or connector issues in the heater circuit, Blown fuse related to the O2 sensor heater.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1138 MINI Description
The P1138 MINI code indicates a problem with the O2 sensor heater circuit in Bank 1 Sensor 2. The O2 sensor, also known as the oxygen sensor, plays a crucial role in monitoring the oxygen levels in the exhaust gases to help the engine control module (ECM) adjust the air-fuel mixture for optimal combustion. The heater circuit in the sensor is responsible for ensuring the sensor reaches operating temperature quickly for accurate readings.
Common Causes of P1138 MINI
- Faulty O2 sensor heater circuit
- Wiring or connector issues in the heater circuit
- Blown fuse related to the O2 sensor heater
- ECM software or hardware malfunction
- Environmental factors such as exposure to water or corrosion
Symptoms of P1138 MINI
- Check Engine Light illuminated
- Poor fuel economy
- Engine running rough or misfiring
- Increased emissions
- Reduced engine power
How to Fix P1138 MINI
- Diagnose the issue by using an OBD-II scanner to read the code and determine the specific problem with the O2 sensor heater circuit.
- Inspect the wiring and connectors to check for any damage or corrosion. Repair or replace as needed.
- Test the O2 sensor heater circuit resistance to verify if the sensor is functioning correctly. Replace the sensor if necessary.
- Check the fuse related to the O2 sensor heater and replace if blown.
- Clear the error code and reset the ECM to see if the issue has been resolved.
Cost to Fix P1138 MINI
The typical repair costs for addressing a P1138 MINI code can range from $150 to $500, depending on the specific cause of the problem and the cost of parts and labor. This estimate includes the cost of a new O2 sensor if replacement is necessary, as well as any additional components that may need to be repaired or replaced. Keep in mind that labor rates can vary between different auto repair shops, so it is recommended to obtain quotes from multiple sources to find the best deal.
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