P0139 Infiniti Code - HO2S12 Slow Response
Quick Answer
The P0139 code for Infiniti vehicles refers to a problem with the HO2S12 sensor, specifically indicating a slow response from this sensor. Common causes include Contaminated or damaged HO2S12 sensor, Faulty sensor heating element, Wiring issues or poor connection to 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
- P0139 Infiniti indicates HO2S12 Slow Response.
- Common causes
- Common causes include Contaminated or damaged HO2S12 sensor, Faulty sensor heating element, Wiring issues or poor connection to 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 P0139 Infiniti Description
The P0139 code for Infiniti vehicles refers to a problem with the HO2S12 sensor, specifically indicating a slow response from this sensor. The HO2S12 sensor is part of the emissions control system in the vehicle and is responsible for monitoring the oxygen levels in the exhaust gases. This information is crucial for the engine control unit (ECU) to adjust the air-fuel mixture for optimal combustion. A slow response from the sensor can lead to inaccurate readings, resulting in poor engine performance, reduced fuel efficiency, and increased emissions.
Common Causes of P0139 Infiniti
- Contaminated or damaged HO2S12 sensor
- Faulty sensor heating element
- Wiring issues or poor connection to the sensor
- Malfunctioning ECU
- Exhaust leaks affecting sensor readings
Symptoms of P0139 Infiniti
- Rough idling or engine misfires
- Decreased fuel efficiency
- Hesitation or lack of power during acceleration
- Illumination of the check engine light
How to Fix P0139 Infiniti
- Begin by using a diagnostic scanner to confirm the P0139 code and identify the specific issue with the HO2S12 sensor.
- Inspect the sensor, wiring, and connector for any visible damage or contamination. Clean or replace the sensor as needed.
- Test the sensor heating element to ensure it is functioning properly. Replace if necessary.
- Check the wiring for any breaks or shorts, and repair or replace as needed.
- Clear the error code from the ECU's memory and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0139 Infiniti
The cost of repairing a P0139 code on an Infiniti vehicle can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of replacing an oxygen sensor can range from $200 to $500, including parts and labor. Additional costs may apply if wiring repairs or ECU diagnostics are required. It's recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can be higher in metropolitan areas or at dealerships.
Tech Notes for P0139 Infiniti
When is the Code Detected?
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Information for Specific Infiniti Models
- P0139 2003 Infiniti G35 — HO2S12 Slow Response
- P0139 2004 Infiniti G35 — HO2S12 Slow Response
- P0139 2005 Infiniti G35 — HO2S12 Slow Response
- P0139 2006 Infiniti G35 — HO2S12 Slow Response
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