P0402 Nissan Code - Exhaust Gas Recirculation Flow Excessive Detected
Quick Answer
The P0402 diagnostic trouble code for Nissan vehicles indicates that there is an excessive flow detected in the Exhaust Gas Recirculation (EGR) system. Common causes include Stuck open EGR valve, Clogged EGR passage, Faulty 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 Nissan indicates Exhaust Gas Recirculation Flow Excessive Detected.
- Common causes
- Common causes include Stuck open EGR valve, Clogged EGR passage, Faulty 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.
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Code P0402 Nissan Description
The P0402 diagnostic trouble code for Nissan vehicles indicates that there is an excessive flow detected in the Exhaust Gas Recirculation (EGR) system. The EGR system plays a crucial role in reducing harmful emissions by recirculating a portion of the exhaust gases back into the engine's intake manifold. This allows for a more complete combustion process and helps to lower nitrogen oxide (NOx) emissions. When the EGR flow is excessive, it can lead to a variety of issues that can impact the vehicle's performance and emissions output.
Common Causes of P0402 Nissan
- Stuck open EGR valve
- Clogged EGR passage
- Faulty EGR temperature sensor
- Vacuum leaks in the EGR system
- Carbon buildup in the EGR system
Symptoms of P0402 Nissan
- Reduced engine performance
- Rough idling or stalling
- Poor acceleration
- Check Engine Light illuminated
- Hesitation during acceleration
How to Fix P0402 Nissan
- Start by diagnosing the specific cause of the excessive EGR flow, such as testing the EGR valve, checking the EGR passage for blockages, and inspecting the EGR temperature sensor.
- Clean or replace the EGR valve if it is stuck open or faulty.
- Clear any blockages in the EGR passage to ensure proper flow.
- Replace the EGR temperature sensor if it is malfunctioning.
- Reset the Check Engine Light and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0402 Nissan
The cost of repairing a P0402 code can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, the total repair cost for addressing an excessive EGR flow detected code like P0402 can range from $200 to $500. It's recommended to consult with a trusted mechanic or repair shop to get a more accurate estimate based on your vehicle's make and model. Keep in mind that labor rates can vary based on location and shop rates.
When is the Code Detected?
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Frequently Asked Questions about P0402 Nissan Code
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Discuss the causes and fixes for P0402 Nissan OBDII Code
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Does the security light stays solid ON while cranking the engine? If the light is ON then you may have to reprogram the keys. The P0402 code is no related to the engine start.
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