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P0402 Lexus Code - Exhaust Gas Recirculation Flow Excessive Detected

Quick Answer

The P0402 code for a Lexus indicates that there is excessive exhaust gas recirculation (EGR) flow detected. Common causes include Faulty EGR valve, Clogged EGR passage, Vacuum leak in the EGR system. 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
P0402 Lexus indicates Exhaust Gas Recirculation Flow Excessive Detected.
Common causes
Common causes include Faulty EGR valve, Clogged EGR passage, Vacuum leak in the EGR system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0402 Lexus Description

The P0402 code for a Lexus indicates that there is excessive exhaust gas recirculation (EGR) flow detected. The EGR system is responsible for reducing nitrogen oxide emissions by recirculating a portion of the exhaust gas back into the engine's intake system. When the EGR system is functioning properly, it helps to lower combustion temperatures and reduce emissions. However, if there is excessive flow detected, it can lead to a variety of issues that can affect the vehicle's performance.

OBDII Code P0402 Lexus - Exhaust Gas Recirculation Flow Excessive Detected
P0402 Lexus Code - Exhaust Gas Recirculation Flow Excessive Detected

Common Causes of P0402 Lexus

  1. Faulty EGR valve
  2. Clogged EGR passage
  3. Vacuum leak in the EGR system
  4. Problem with the EGR sensor

Symptoms of P0402 Lexus

  1. Rough idling
  2. Poor acceleration
  3. Decreased fuel efficiency
  4. Engine knocking or pinging
  5. Check engine light illuminated

How to Fix P0402 Lexus

  1. Diagnose the issue by using a scan tool to retrieve the trouble code and inspecting the EGR system components.
  2. Test the EGR valve for proper operation and replace if necessary.
  3. Clean out any clogged EGR passages or replace any damaged components.
  4. Check for vacuum leaks in the EGR system and repair as needed.
  5. Clear the trouble code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0402 Lexus

The typical repair costs for a P0402 code on a Lexus can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

When is the Code Detected?

High Exhaust Gas Recirculation (EGR) flow control is detected

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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.

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