P0139 2017 Toyota RAV4 Code - Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2
Quick Answer
In order to obtain a high purification rate of the Carbon Monoxide (CO), Hydrocarbon (HC), and Nitrogen Oxide (NOx) components in the exhaust gas, a Three-Way Catalytic Converter (TWC) is used. Common causes include Faulty Oxygen Sensor Bank 1 Sensor 2, Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection. 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 2017 Toyota RAV4 indicates Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty Oxygen Sensor Bank 1 Sensor 2, Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted, Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection.
- 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.
Code P0139 2017 Toyota RAV4 Description
The heated oxygen sensor is located behind the TWC and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low).
When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gas is high. The heated oxygen sensor informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e. less than 0.45 V).
Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gas is low. The heated oxygen sensor informs the ECM that the post-TWC air-fuel ratio is rich (high voltage, i.e. more than 0.45 V). The heated oxygen sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level.
The ECM uses the supplementary information from the heated oxygen sensor to determine whether the air-fuel ratio after the TWC is rich or lean and adjusts the fuel injection duration accordingly. Thus, if the heated oxygen sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air-fuel ratio control.
The ECM continuously monitors the heated oxygen sensor output voltage while the engine is running. The sensor output voltage drops to below 0.2 V (extremely lean status) immediately when the vehicle decelerates, and the fuel cut is operating. If the voltage does not drop to below 0.2 V for 7 seconds or more, the ECM determines that the sensor response has deteriorated, illuminates the MIL, and stores a Diagnostic Trouble Code (DTC).
What are the Possible Causes of the DTC P0139 2017 Toyota RAV4?
- Faulty Oxygen Sensor Bank 1 Sensor 2
- Oxygen Sensor Bank 1 Sensor 2 harness is open or shorted
- Oxygen Sensor Bank 1 Sensor 2 circuit poor electrical connection
- Gas leak from exhaust system
How to Fix the DTC P0139 2017 Toyota RAV4?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0139 2017 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0139 2017 Toyota RAV4 Code
1. What does OBDII code P0139 on a 2017 Toyota RAV4 mean?
- This code indicates a slow response from the oxygen sensor located after the catalytic converter on bank 1, sensor 2.
2. What are the common symptoms of a P0139 code in a Toyota RAV4?
- Common symptoms include decreased fuel efficiency, rough idling, and potential hesitation or stalling during acceleration.
3. What are the possible causes of a P0139 code in a 2017 Toyota RAV4?
- The code can be triggered by issues such as a faulty oxygen sensor, wiring problems, exhaust leaks, or a damaged catalytic converter.
4. How can I diagnose a P0139 code in my Toyota RAV4?
- Diagnosing the issue involves checking the oxygen sensor's wiring, connections, and sensor performance using a scan tool and multimeter.
5. Can a P0139 code be triggered by a loose gas cap on a Toyota RAV4?
- While a loose gas cap can trigger some codes, P0139 specifically relates to the oxygen sensor's slow response and is not typically caused by a loose gas cap.
6. What are the repair options for a P0139 code on a 2017 Toyota RAV4?
- Repairs may involve replacing the oxygen sensor, repairing or replacing damaged wiring, fixing exhaust leaks, or addressing issues with the catalytic converter.
7. How important is it to address a P0139 code promptly in a Toyota RAV4?
- It is important to address the P0139 code promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance and fuel efficiency.
8. Can I drive my Toyota RAV4 with a P0139 code?
- While you may be able to drive with a P0139 code, it is recommended to address the issue promptly to prevent further damage to the vehicle and maintain optimal performance.
9. How long does it typically take to repair a P0139 code on a 2017 Toyota RAV4?
- The repair time for a P0139 code can vary depending on the exact cause, but it may take anywhere from 30 minutes to a few hours to complete the necessary repairs.
10. Will resetting the OBDII system clear a P0139 code on a Toyota RAV4?
- Resetting the system may temporarily clear the code, but it is important to diagnose and address the underlying issue to prevent the code from reoccurring.
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