Engine-Codes.com
Engine-Codes – Lexus – P1555 Lexus

P1555 Lexus Code - Reactor Temperature Sensor Circuit Low

Quick Answer

The P1555 diagnostic trouble code for Lexus vehicles indicates a problem with the reactor temperature sensor circuit being too low. Common causes include Faulty Sensor: The reactor temperature sensor itself may be malfunctioning, providing inaccurate readings to the vehicle's engine control module, Wiring Issues: Problems with the wiring connecting the sensor to the engine control module can also trigger this code, Catalytic Converter Problems: Issues with the catalytic converter, such as clogging or damage, can lead to incorrect temperature readings from the sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1555 Lexus indicates Reactor Temperature Sensor Circuit Low.
Common causes
Common causes include Faulty Sensor: The reactor temperature sensor itself may be malfunctioning, providing inaccurate readings to the vehicle's engine control module, Wiring Issues: Problems with the wiring connecting the sensor to the engine control module can also trigger this code, Catalytic Converter Problems: Issues with the catalytic converter, such as clogging or damage, can lead to incorrect temperature readings from the sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1555 Lexus Description

The P1555 diagnostic trouble code for Lexus vehicles indicates a problem with the reactor temperature sensor circuit being too low. The reactor temperature sensor is a crucial component in the vehicle's emissions system, responsible for monitoring and regulating the temperature of the catalytic converter. The catalytic converter plays a key role in reducing harmful emissions by converting toxic gases into less harmful ones.

OBDII Code P1555 Lexus - Reactor Temperature Sensor Circuit Low
P1555 Lexus Code - Reactor Temperature Sensor Circuit Low

Common Causes of P1555 Lexus

  1. Faulty Sensor: The reactor temperature sensor itself may be malfunctioning, providing inaccurate readings to the vehicle's engine control module.
  2. Wiring Issues: Problems with the wiring connecting the sensor to the engine control module can also trigger this code.
  3. Catalytic Converter Problems: Issues with the catalytic converter, such as clogging or damage, can lead to incorrect temperature readings from the sensor.
  4. Exhaust System Leaks: Leaks in the exhaust system can cause fluctuations in temperature readings, triggering the code.

Symptoms of P1555 Lexus

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A decrease in fuel efficiency may be noticed as a result of the engine running inefficiently.
  3. Poor Performance: The vehicle may experience a decrease in overall performance, such as hesitation or lack of power.
  4. Emission Test Failure: If the vehicle undergoes an emissions test, it may fail due to increased emissions caused by the faulty sensor.

How to Fix P1555 Lexus

  1. Diagnose the Issue: Use a diagnostic tool to read the trouble codes and pinpoint the specific cause of the problem.
  2. Inspect the Sensor: Check the reactor temperature sensor for any signs of damage or malfunction and replace it if necessary.
  3. Check Wiring: Inspect the wiring connecting the sensor to the engine control module for any breaks or loose connections and repair as needed.
  4. Test Catalytic Converter: Ensure the catalytic converter is functioning properly and replace it if necessary.
  5. Clear Codes: After making the necessary repairs, clear the trouble codes from the vehicle's system to reset the check engine light.

Cost to Fix P1555 Lexus

The cost of repairing a P1555 reactor temperature sensor circuit low code can vary depending on the specific cause of the issue and the labor rates of the repair shop. On average, the cost of replacing a faulty sensor can range from $100 to $300, while fixing wiring issues may cost between $50 to $150. If the catalytic converter needs to be replaced, this can be a more expensive repair, with costs ranging from $500 to $2000 or more. Additionally, labor costs can add to the overall repair bill, with rates typically ranging from $80 to $150 per hour. It's advisable to consult a professional mechanic for a more accurate estimate based on the specific circumstances of your vehicle.

Need more information about the P1555 Lexus code?

Need more information on how to fix the P1555 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1555 Lexus code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1555 Lexus Code

1. What does the OBDII code P1555 mean on a Lexus?

P1555 on a Lexus indicates a problem with the Reactor Temperature Sensor Circuit, specifically that the sensor is reading a low voltage or temperature.

2. What are the common symptoms of code P1555 in a Lexus?

Common symptoms include the check engine light turning on, reduced engine performance, and potentially increased emissions.

3. What causes the P1555 code to appear on a Lexus?

Possible causes include a faulty reactor temperature sensor, damaged wiring or connectors, or a malfunctioning engine control module (ECM).

4. Can I drive my Lexus with the P1555 code active?

Driving with the P1555 code is not recommended, as it may lead to poor engine performance or damage to the emissions system if not addressed promptly.

5. How do I diagnose the P1555 code on my Lexus?

Diagnosis involves inspecting the reactor temperature sensor, checking for damaged wiring or loose connections, and using a multimeter to test sensor output voltage.

6. What tools are needed to fix the P1555 code on a Lexus?

You'll need an OBDII scanner, a multimeter, and basic hand tools to diagnose and repair issues related to the reactor temperature sensor circuit.

7. How much does it cost to fix the P1555 code on a Lexus?

Repair costs can vary, but replacing the reactor temperature sensor typically ranges from $100 to $300, depending on parts and labor.

8. Can a dirty or clogged sensor cause the P1555 code?

Yes, a dirty or clogged sensor may cause inaccurate readings, which could trigger the P1555 code.

9. How do I reset the P1555 code after repairs?

After addressing the issue, use an OBDII scanner to clear the code, or disconnect the battery for a few minutes to reset the ECM.

10. Is the P1555 code specific to Lexus vehicles?

While P1555 can appear on other vehicles, its meaning may vary. For Lexus, it specifically refers to the Reactor Temperature Sensor Circuit Low.

Discuss the causes and fixes for P1555 Lexus OBDII Code

Submit a New Comment

Code P1555 Lexus comments

No comments found for this page.