P0137 Lexus 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 Lexus 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 Lexus 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 Lexus?
- 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 Lexus?
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 Lexus 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 Lexus Code
1. What are the common symptoms of OBDII code P0137 in a Lexus?
- Common symptoms include poor fuel economy, rough idling, engine hesitation, and the illumination of the check engine light.
2. What does the OBDII code P0137 for a Lexus indicate?
- The code P0137 indicates a low voltage condition in the oxygen sensor circuit of Bank 1 Sensor 2 in a Lexus.
3. What are the possible causes of OBDII code P0137 in a Lexus?
- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, engine misfires, or issues with the engine control module.
4. How can I diagnose the OBDII code P0137 in my Lexus?
- Diagnosing code P0137 involves using a scan tool to read the code, inspecting the oxygen sensor and its wiring, checking for exhaust leaks, and testing the sensor's voltage output.
5. Can a faulty oxygen sensor cause code P0137 in a Lexus?
- Yes, a faulty oxygen sensor in Bank 1 Sensor 2 can trigger code P0137 due to its inability to accurately measure the oxygen levels in the exhaust.
6. How can I repair OBDII code P0137 in my Lexus?
- Repair options may include replacing the oxygen sensor, repairing damaged wiring, fixing exhaust leaks, addressing engine misfires, or reprogramming the engine control module.
7. Is it safe to continue driving my Lexus with OBDII code P0137?
- It is generally not recommended to continue driving with code P0137, as it can lead to poor engine performance and potentially cause damage to the catalytic converter.
8. Can a simple reset of the check engine light fix code P0137 in a Lexus?
- Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing code P0137 in the oxygen sensor circuit.
9. How do I prevent OBDII code P0137 from recurring in my Lexus?
- To prevent code P0137 from recurring, ensure regular maintenance of your Lexus, address any engine performance issues promptly, and use high-quality fuel and oil.
10. Can a DIY enthusiast repair OBDII code P0137 in a Lexus?
- Depending on the level of expertise, a DIY enthusiast may be able to repair code P0137 by following the repair tips provided, but complex issues may require professional assistance.
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