P0051 Lexus Code - Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1
Quick Answer
The P0051 code for a Lexus indicates a problem with the oxygen sensor heater control circuit on Bank 2 Sensor 1. Common causes include Faulty oxygen sensor, Damaged wiring or connectors in the oxygen sensor circuit, Blown fuse related to the oxygen sensor heater circuit. 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
- P0051 Lexus indicates Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1.
- Common causes
- Common causes include Faulty oxygen sensor, Damaged wiring or connectors in the oxygen sensor circuit, Blown fuse related to the oxygen sensor heater circuit.
- 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.
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Code P0051 Lexus Description
The P0051 code for a Lexus indicates a problem with the oxygen sensor heater control circuit on Bank 2 Sensor 1. This sensor is responsible for measuring the oxygen content in the exhaust gases and sending this information to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater control circuit in the oxygen sensor is essential for ensuring accurate and rapid sensor response during cold starts and under certain operating conditions.
Common Causes of P0051 Lexus
- Faulty oxygen sensor
- Damaged wiring or connectors in the oxygen sensor circuit
- Blown fuse related to the oxygen sensor heater circuit
- ECM software issue
- Exhaust leaks near the sensor
Symptoms of P0051 Lexus
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Rough idling or stalling
- Engine misfires
- Failed emissions test
How to Fix P0051 Lexus
- Diagnose the issue with a scan tool to confirm the P0051 code and pinpoint the exact cause.
- Inspect the wiring and connectors for any damage or corrosion. Repair or replace as needed.
- Check the oxygen sensor heater fuse and replace if blown.
- Test the oxygen sensor heater for proper operation and replace if necessary.
- Clear the code and perform a test drive to verify that the issue has been resolved.
Cost to Fix P0051 Lexus
The typical repair costs for addressing a P0051 code on a Lexus can range from $150 to $400, including parts and labor. However, the actual cost can vary depending on the specific model of the Lexus, the location of the repair shop, and any additional issues that may be uncovered during the diagnosis and repair process. It's recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your specific situation.
Tech Notes for P0051 Lexus
2004-2005 Lexus ES 330 Factory Service Bulletin OBDII Code P0051
When is the Code Detected?
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Frequently Asked Questions about P0051 Lexus Code
1. What are the common symptoms of OBDII code P0051 in a Lexus?
- Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the Check Engine Light.
2. What does the OBDII code P0051 in a Lexus indicate?
- The code P0051 indicates an issue with the oxygen sensor heater control circuit low in Bank 2 Sensor 1.
3. What are the possible causes of OBDII code P0051 in a Lexus?
- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the engine control module (ECM).
4. How can I diagnose the OBDII code P0051 in my Lexus?
- Diagnose the code by checking the oxygen sensor heater circuit for continuity, inspecting wiring for damage, and verifying proper voltage to the sensor.
5. How can I repair OBDII code P0051 in a Lexus?
- Repair options include replacing the oxygen sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, and resetting the ECM.
6. Can I drive my Lexus with OBDII code P0051?
- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential damage to the catalytic converter.
7. How much does it cost to repair OBDII code P0051 in a Lexus?
- The cost of repairing this code can vary depending on the underlying issue, but it typically ranges from $200 to $500 for parts and labor.
8. Will resetting the Check Engine Light resolve OBDII code P0051 in a Lexus?
- Resetting the Check Engine Light may temporarily remove the warning, but the underlying issue causing the code will persist until properly diagnosed and repaired.
9. Is it possible to prevent OBDII code P0051 from occurring in my Lexus?
- Regular maintenance, such as checking and replacing oxygen sensors as recommended, can help prevent the occurrence of code P0051 in your Lexus.
10. How long does it take to repair OBDII code P0051 in a Lexus?
- The repair time for this code can vary depending on the exact cause and the availability of parts, but it typically takes 1-2 hours at a professional repair shop.
Discuss the causes and fixes for P0051 Lexus OBDII Code
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Hi, I own a 05 Lexus GX470, I have a Christmas tree in my dash, and the codes I'm getting form the OBDC reader are P0031 and P0051. I checked all the wires for voltage and resistance, and they're good. Replaced all 4 oxygen sensors wirh genuine OEM, replaced the ECU twice, each time with a different one but same part number as the original. I have a whole year trying to resolve this problem to no avail. The vehicle, currently has 154k miles in the speedometer. I have not have any other mechanical problem besides this one. I just red somewhere in this site to check for the relay and the fuse. Couldn't find either one in my vehicle, or perhaps they have a different name on the fuse box cover.
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Both, the A/F Heater Relay and A/F Heater Fuse, are in the fuse box in the engine compartment.
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If the fuse, relay and sensors are OK, then the next step is to check the wires from the sensor to the ECU.
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I could be wrong, but my logical view on the P0051 code is that if the #6 A/F relay or fuse were related to the P0051 fault code, it stands to reason that both or all AF mix "Short and long term Fuel trim sensors" would be throwing that code. The reason for this logic is that B1/S1 and B2/S2 are powered by the same #6 Relay and AF Fuse so B1/S1 fault code should also be coming up in the DTCs?
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No, both Air Fuel Ratio Sensors (A/F or Front Sensors) are powered by the 'A/F Relay' (#6), and the Rear Heater Oxygen Sensors are powered by the 'EFI Relay' (#8). Therefore, if the A/F Relay is faulty, it could trigger the P0031 and P0051 engine codes.
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