AutoCodes – Mercedes-Benz – P1402 Mercedes-Benz

P1402 Mercedes-Benz Code - Exhaust Gas Recirculation Open-Loop Control

Quick Answer

P1402 Mercedes-Benz indicates Exhaust Gas Recirculation Open-Loop Control. Common causes include The EGR volume control valve circuit harness is open or shorted, EGR volume control valve leaking or stuck open, 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: P1402 Mercedes-Benz indicates Exhaust Gas Recirculation Open-Loop Control.
Common causes: Common causes include The EGR volume control valve circuit harness is open or shorted, EGR volume control valve leaking or stuck open, 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 Popularity 26,338

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 16, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1402 Mercedes-Benz Description

OBDII Code P1402 Mercedes-Benz - Exhaust Gas Recirculation Open-Loop Control - AutoCodes.com — P1402 Mercedes-Benz Code - Exhaust Gas Recirculation Open-Loop Control

What does this mean?

What are the Possible Causes of the DTC P1402 Mercedes-Benz?

The EGR volume control valve circuit harness is open or shorted
EGR volume control valve leaking or stuck open
Faulty EGR temperature sensor

How to Fix the DTC P1402 Mercedes-Benz?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Start by cleaning the EGR valve, if the code persists it may be necessary to replaced the EGR Valve

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1402 Mercedes-Benz code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1402 Mercedes-Benz code?

Need more information on how to fix the P1402 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1402 Mercedes-Benz 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 P1402 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P1402 (Exhaust Gas Recirculation Open-Loop Control) in a Mercedes-Benz?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and the illumination of the Check Engine light.

2. What are the typical causes of OBDII code P1402 in a Mercedes-Benz?

- The main causes of P1402 in a Mercedes-Benz are a faulty EGR valve, issues with the EGR vacuum control solenoid, or problems with the EGR system wiring.

3. How can I diagnose OBDII code P1402 in my Mercedes-Benz?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the EGR valve and related components for damage or blockages, and testing the EGR system's electrical connections.

4. Can I continue driving my Mercedes-Benz with OBDII code P1402?

- It is not recommended to continue driving with code P1402 present, as it can lead to poor engine performance, decreased fuel economy, and potential damage to other engine components.

5. How can I repair OBDII code P1402 in my Mercedes-Benz?

- Repairing code P1402 may involve replacing the faulty EGR valve, repairing or replacing damaged wiring, or cleaning and testing the EGR system components to ensure proper functioning.

6. Are there any DIY tips for addressing OBDII code P1402 in a Mercedes-Benz?

- DIY enthusiasts can try to clean the EGR valve and passages first to see if that resolves the issue. However, if the problem persists, it's best to consult a professional mechanic for thorough diagnosis and repair.

7. How much does it typically cost to repair OBDII code P1402 in a Mercedes-Benz?

- The cost of repairing code P1402 in a Mercedes-Benz can vary depending on the exact cause of the issue, but it may range from $200 to $600, including parts and labor.

8. How long does it take to repair OBDII code P1402 in a Mercedes-Benz?

- The repair time for code P1402 can vary based on the extent of the issue and the availability of parts, but it typically takes a few hours to a day to diagnose and fix the problem.

9. Can a Mercedes-Benz dealership help with diagnosing and repairing OBDII code P1402?

- Yes, Mercedes-Benz dealerships have trained technicians and specialized equipment to diagnose and repair OBDII codes like P1402 efficiently and effectively.

10. What preventive measures can I take to avoid OBDII code P1402 in my Mercedes-Benz in the future?

- To prevent OBDII code P1402, regularly maintain your vehicle, use quality fuel, clean the EGR system components periodically, and address any engine performance issues promptly.