P0137 2018 Toyota RAV4 Code - Oxygen Sensor Circuit Low Voltage 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
- P0137 2018 Toyota RAV4 indicates Oxygen Sensor Circuit Low Voltage 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 P0137 2018 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 impedance cannot be measured using an ohmmeter. Diagnostic Trouble Code (DTC) P0137 indicates an open or short circuit in the heated oxygen sensor (2 driving cycles). The ECM stores the DTC when the impedance of the sensor exceeds the threshold 15 kΩ.
What are the Possible Causes of the DTC P0137 2018 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 P0137 2018 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 P0137 2018 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 P0137 2018 Toyota RAV4 Code
1. What does OBDII code P0137 in a 2018 Toyota RAV4 mean?
- This code, Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2, indicates a potential issue with the oxygen sensor located downstream (after the catalytic converter) on the bank 1 side of the engine.
2. What are the common symptoms of a P0137 code on a 2018 Toyota RAV4?
- Common symptoms include poor fuel economy, rough idling, loss of power, and illuminated Check Engine Light on the dashboard.
3. What are the possible causes of a P0137 code in a 2018 Toyota RAV4?
- The code can be triggered by a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's fuel system.
4. How can I diagnose a P0137 code in my 2018 Toyota RAV4?
- Diagnosing involves checking the oxygen sensor's voltage readings, inspecting the sensor and its wiring for damage, and looking for any exhaust leaks near the sensor.
5. Can I drive my 2018 Toyota RAV4 with a P0137 code?
- It is generally safe to drive with a P0137 code, but it is recommended to address the issue promptly to prevent further damage and maintain optimal engine performance.
6. How can I repair a P0137 code in my 2018 Toyota RAV4?
- Repair options include replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, or addressing any fuel system problems causing the low voltage reading.
7. Is it possible to reset the P0137 code on a 2018 Toyota RAV4 without fixing the issue?
- While you can clear the code with an OBDII scanner, the Check Engine Light will likely reappear if the underlying problem causing the low voltage reading is not resolved.
8. How much does it cost to fix a P0137 code in a 2018 Toyota RAV4?
- The cost of fixing a P0137 code can vary depending on the specific cause and repair needed, but it typically ranges from $100 to $300 for parts and labor.
9. Can a P0137 code in a 2018 Toyota RAV4 affect emissions testing?
- Yes, a P0137 code can cause your vehicle to fail emissions testing due to improper oxygen sensor function, which is crucial for emissions control and monitoring.
10. How often should the oxygen sensors be replaced in a 2018 Toyota RAV4 to prevent P0137 codes?
- Oxygen sensors typically last around 60,000-90,000 miles, but it is recommended to follow the manufacturer's maintenance schedule and replace them as needed to prevent issues like P0137 codes.
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