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P0402 Toyota Code - Exhaust Gas Recirculation Flow Excessive Detected

Quick Answer

The P0402 diagnostic trouble code for Toyota vehicles indicates that the Exhaust Gas Recirculation (EGR) system is flowing excessively. Common causes include Faulty EGR valve, Clogged EGR passages, Malfunctioning EGR temperature sensor. 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 Toyota indicates Exhaust Gas Recirculation Flow Excessive Detected.
Common causes
Common causes include Faulty EGR valve, Clogged EGR passages, Malfunctioning EGR temperature sensor.
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 08, 2024
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Code P0402 Toyota Description

The P0402 diagnostic trouble code for Toyota vehicles indicates that the Exhaust Gas Recirculation (EGR) system is flowing excessively. The EGR system is responsible for recirculating a portion of exhaust gases back into the engine's combustion chambers to reduce nitrogen oxide emissions. When the EGR flow is excessive, it can lead to a variety of performance issues in the vehicle.

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

Common Causes of P0402 Toyota

  1. Faulty EGR valve
  2. Clogged EGR passages
  3. Malfunctioning EGR temperature sensor
  4. EGR vacuum solenoid issue
  5. Carbon buildup in the EGR system

Symptoms of P0402 Toyota

  1. Decreased engine power
  2. Rough idling or stalling
  3. Poor fuel efficiency
  4. Increased emissions
  5. Check Engine Light illuminated

How to Fix P0402 Toyota

  1. Use an OBD-II scanner to read and clear the P0402 code.
  2. Inspect the EGR valve for proper function and replace if necessary.
  3. Check and clean the EGR passages to remove any carbon buildup.
  4. Test the EGR temperature sensor and replace if faulty.
  5. Verify proper operation of the EGR vacuum solenoid and replace if needed.

Cost to Fix P0402 Toyota

The cost of repairing a P0402 code on a Toyota vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $100 to $300 as well. Overall, you can expect to pay anywhere from $200 to $600 for the repair, but it's advisable to obtain a detailed quote from a reputable auto repair shop in your region. Keep in mind that diagnostic time and labor rates can impact the final cost, so it's essential to factor in these variables when budgeting for the repair.

When is the Code Detected?

High Exhaust Gas Recirculation (EGR) flow control is detected

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Information for Specific Toyota Models

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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