P0136 Lexus Code - Oxygen Sensor Circuit Malfunction 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
- P0136 Lexus indicates Oxygen Sensor Circuit Malfunction 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 P0136 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) P0136 indicates the deterioration of the heated oxygen sensor. The ECM stores the DTC by calculating the impedance of the sensor when the typical enabling conditions are satisfied.
What are the Possible Causes of the DTC P0136 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 P0136 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 P0136 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 P0136 Lexus Code
1. What are the common symptoms of OBDII code P0136 in a Lexus?
- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.
2. What does the OBDII code P0136 indicating a "Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2" mean in a Lexus?
- This code indicates that there is a problem with the oxygen sensor located downstream (after the catalytic converter) on bank 1 of the engine.
3. What are the possible causes of the P0136 code in a Lexus?
- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, a faulty catalytic converter, or an issue with the engine's fuel system.
4. How can I diagnose the P0136 code in a Lexus?
- Diagnosing the P0136 code typically involves using an OBDII scanner to read the code, inspecting the oxygen sensor and its wiring, checking for exhaust leaks, and testing the catalytic converter.
5. How serious is the P0136 code in a Lexus, and can I continue driving the vehicle?
- While the vehicle may still be driveable with the P0136 code, it is not recommended to ignore it. Continuing to drive with this issue can lead to decreased fuel efficiency and potentially cause damage to the catalytic converter.
6. Can I repair the P0136 code myself, or do I need to take my Lexus to a mechanic?
- Depending on your mechanical skills and access to tools, you may be able to repair the P0136 code yourself. However, if you are unsure or inexperienced, it is recommended to take your Lexus to a qualified mechanic for proper diagnosis and repair.
7. Is it safe to drive my Lexus with the P0136 code for an extended period?
- It is not advisable to drive your Lexus with the P0136 code for an extended period as it can lead to decreased performance and potential damage to other components in the long run.
8. How much does it typically cost to repair the P0136 code in a Lexus?
- The cost of repairing the P0136 code can vary depending on the exact cause of the issue. Typically, replacing the oxygen sensor can cost between $200 to $400, while addressing other potential issues such as wiring or exhaust leaks may increase the cost.
9. Can a faulty oxygen sensor cause other problems in my Lexus besides triggering the P0136 code?
- Yes, a faulty oxygen sensor can cause a variety of issues in your Lexus, including poor fuel economy, engine misfires, and increased emissions. It is essential to address the problem promptly to prevent further damage.
10. How often should the oxygen sensors be replaced in a Lexus to prevent the P0136 code from occurring?
- Oxygen sensors typically have a lifespan of around 60,000 to 100,000 miles, but it is recommended to follow your Lexus manufacturer's guidelines for maintenance and replace them as needed to prevent issues like the P0136 code.
Discuss the causes and fixes for P0136 Lexus OBDII Code
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Thank you so much for a precise concise explanation of the trouble code. That really assists in understanding, too many other forums just basically grunt and point without the care for your comprehension. Once again thank you.
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