P0139 2013 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 2013 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 2013 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 2013 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 2013 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 2013 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.
Need more information about the P0139 2013 Toyota RAV4 code?
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Frequently Asked Questions about P0139 2013 Toyota RAV4 Code
1. What are the common symptoms of OBDII code P0139 on a 2013 Toyota RAV4?
- Common symptoms include decreased fuel efficiency, rough idling, and potential issues with the vehicle's emission levels.
2. What does the OBDII code P0139 "Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2" mean for a 2013 Toyota RAV4?
- This code indicates that the oxygen sensor downstream of the catalytic converter on bank 1 is not responding quickly enough to changes in the air-fuel mixture.
3. What are the possible causes of the P0139 code on a 2013 Toyota RAV4?
- The code can be triggered by a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's air-fuel ratio.
4. How can I diagnose the P0139 code on my 2013 Toyota RAV4?
- Diagnosing the code typically involves inspecting the oxygen sensor, checking the wiring and connectors for damage, and looking for any leaks in the exhaust system.
5. Can I continue driving my 2013 Toyota RAV4 with the P0139 code present?
- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.
6. How can I repair the P0139 code on my 2013 Toyota RAV4?
- Repair options may include replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, and addressing any issues affecting the air-fuel ratio.
7. Is it possible to reset the OBDII code P0139 on a 2013 Toyota RAV4 without fixing the underlying issue?
- While clearing the code may temporarily turn off the check engine light, it will not solve the underlying problem causing the code to trigger. It is recommended to address the root cause of the issue.
8. How much does it cost to repair the P0139 code on a 2013 Toyota RAV4?
- The cost of repair can vary depending on the specific issue causing the code, but it may range from $100 to $300 for parts and labor.
9. Can a DIY enthusiast fix the P0139 code on a 2013 Toyota RAV4?
- Depending on your experience and tools available, DIY enthusiasts may be able to replace the oxygen sensor or repair wiring issues associated with the P0139 code. However, more complex issues may require professional assistance.
10. How often does the P0139 code occur in a 2013 Toyota RAV4?
- The frequency of the P0139 code can vary depending on driving conditions, maintenance history, and the overall health of the vehicle's emission system. Regular maintenance can help prevent this code from occurring.
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