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Engine-Codes – Scion – P0402 Scion

P0402 Scion Code - Exhaust Gas Recirculation Flow Excessive Detected

Quick Answer

When the diagnostic trouble code P0402 appears on a Scion vehicle, it signifies that the Exhaust Gas Recirculation (EGR) system is experiencing excessive flow. 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 Scion 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 12, 2024
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Code P0402 Scion Description

When the diagnostic trouble code P0402 appears on a Scion vehicle, it signifies that the Exhaust Gas Recirculation (EGR) system is experiencing excessive flow. The EGR system plays a crucial role in reducing harmful emissions by recirculating a portion of the exhaust gases back into the engine's combustion chambers. This process helps lower the temperature of combustion while reducing nitrogen oxide emissions.

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

Common Causes of P0402 Scion

  1. Faulty EGR valve
  2. Clogged EGR passages
  3. Malfunctioning EGR temperature sensor
  4. Issues with the EGR vacuum control solenoid

Symptoms of P0402 Scion

  1. Rough idling or engine misfiring
  2. Decreased fuel efficiency
  3. Engine stalling or hesitation
  4. Increased emissions output
  5. Check Engine Light illuminated on the dashboard

How to Fix P0402 Scion

  1. Diagnose the issue by using a scan tool to confirm the P0402 code and inspecting the EGR system components.
  2. Inspect and clean the EGR valve and passages to ensure they are free of carbon build-up or debris.
  3. Test the EGR temperature sensor for proper functionality and replace if necessary.
  4. Check the EGR vacuum control solenoid for proper operation and replace if faulty.
  5. Clear the error code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0402 Scion

The cost of repairing a P0402 code on a Scion vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to obtain quotes from multiple sources to determine the most cost-effective solution.

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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