P0138 Acura Code - Secondary Heated Oxygen Sensor 2 Circuit High Voltage
Quick Answer
The P0138 diagnostic trouble code (DTC) for Acura vehicles indicates that the Secondary Heated Oxygen Sensor 2 Circuit is registering high voltage. Common causes include Faulty oxygen sensor, Wiring issues or shorts in the sensor circuit, Exhaust leaks near the sensor. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0138 Acura indicates Secondary Heated Oxygen Sensor 2 Circuit High Voltage.
- Common causes
- Common causes include Faulty oxygen sensor, Wiring issues or shorts in the sensor circuit, Exhaust leaks near the sensor.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
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Code P0138 Acura Description
The P0138 diagnostic trouble code (DTC) for Acura vehicles indicates that the Secondary Heated Oxygen Sensor 2 Circuit is registering high voltage. This sensor, also known as the downstream oxygen sensor, is responsible for monitoring the exhaust gases after they have passed through the catalytic converter. It helps the engine control module (ECM) adjust the air-fuel mixture to optimize engine performance and reduce emissions. When the voltage from this sensor is higher than expected, it can lead to issues with fuel efficiency, emissions, and overall engine performance.
Common Causes of P0138 Acura
- Faulty oxygen sensor
- Wiring issues or shorts in the sensor circuit
- Exhaust leaks near the sensor
- Issues with the ECM or engine control system
- Contaminated sensor due to oil or coolant leaks
Symptoms of P0138 Acura
- Decreased fuel efficiency
- Rough idling or stalling
- Check Engine Light illuminated
- Poor acceleration
- Failed emissions test
How to Fix P0138 Acura
- Begin by diagnosing the exact cause of the high voltage reading, which may involve checking the sensor's wiring, connections, and the sensor itself.
- If the sensor is faulty, replace it with a new one that is compatible with your Acura model.
- Inspect the sensor circuit for any shorts or damage, repairing or replacing any affected wiring.
- Address any exhaust leaks near the sensor that could be affecting its readings.
- Clear the DTC from the ECM's memory and perform a test drive to ensure the issue has been resolved.
Cost to Fix P0138 Acura
The typical repair cost for addressing a P0138 code in an Acura vehicle can range from $150 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnostic time and labor rates can vary, so it's recommended to consult with a trusted auto repair shop for a more accurate estimate based on your location and vehicle details.
Tech Notes for P0138 Acura
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Frequently Asked Questions about P0138 Acura Code
1. What are the common symptoms of OBDII code P0138 in an Acura related to the secondary heated oxygen sensor 2 circuit high voltage?
- Common symptoms include poor fuel economy, rough idle, engine hesitation, and the illumination of the check engine light.
2. What are the possible causes of the secondary heated oxygen sensor 2 circuit high voltage code P0138 in an Acura?
- Potential causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, a malfunctioning catalytic converter, or issues with the engine's fuel system.
3. How can I diagnose the OBDII code P0138 in my Acura related to the secondary heated oxygen sensor 2 circuit high voltage?
- Diagnosis typically involves inspecting the oxygen sensor, checking the wiring and connectors for damage, testing the catalytic converter, and using a scan tool to monitor sensor readings.
4. What repairs can I perform to fix the secondary heated oxygen sensor 2 circuit high voltage code P0138 in my Acura?
- Repair options may include replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, replacing the catalytic converter if needed, and addressing any fuel system issues.
5. Can I drive my Acura with the P0138 code related to the secondary heated oxygen sensor 2 circuit high voltage?
- It is generally not recommended to continue driving with this code present, as it can lead to reduced fuel efficiency and potentially cause damage to other components of the vehicle over time.
6. How important is it to address the OBDII code P0138 in an Acura related to the secondary heated oxygen sensor 2 circuit high voltage?
- It is crucial to address this code promptly to ensure optimal engine performance, fuel efficiency, and emissions control. Ignoring the issue can lead to more serious problems down the line.
7. Are there any preventive measures I can take to avoid the recurrence of the P0138 code in my Acura?
- Regular maintenance, such as replacing oxygen sensors at recommended intervals, checking for exhaust leaks, and keeping the fuel system in good condition, can help prevent the reoccurrence of this code.
8. How much does it typically cost to repair the secondary heated oxygen sensor 2 circuit high voltage code P0138 in an Acura?
- The cost of repair can vary depending on the specific issue causing the code, the labor rates in your area, and the cost of parts. It is recommended to get a diagnosis from a trusted mechanic for an accurate estimate.
9. Can I reset the check engine light after addressing the P0138 code related to the secondary heated oxygen sensor 2 circuit high voltage in my Acura?
- Yes, once the underlying issue causing the code has been resolved, you can reset the check engine light using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.
10. How long does it take to repair the secondary heated oxygen sensor 2 circuit high voltage code P0138 in an Acura?
- The repair time can vary depending on the exact cause of the code and the complexity of the repair. It is advisable to consult with a mechanic for an estimate of the repair duration.
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