P20EE Mercedes-Benz Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1
Quick Answer
The Diesel Exhaust Fluid (DEF) system commonly called a Selective Catalytic Reduction (SCR) system to reduce harmful Oxides of Nitrogen (NOx). Common causes include Exhaust Leaks, Faulty Catalyst, Faulty NOx Sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P20EE Mercedes-Benz indicates SCR NOx Catalyst Efficiency Below Threshold Bank 1.
- Common causes
- Common causes include Exhaust Leaks, Faulty Catalyst, Faulty NOx Sensor.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P20EE Mercedes-Benz Description
The system requires a storage tank for the diesel exhaust fluid, a pump with an integrated level sensor, pressure sensor, and fluid quality sensor, an injector fitted to the exhaust system, fluid heater, and catalyst. Sensors can also be fitted close to the SCR catalyst to monitor temperature during regeneration.
The system is closely monitored for correct operation as a failure of the system will have a significant impact on vehicle exhaust gas emissions of oxides of Nitrogen.
What are the Possible Causes of the DTC P20EE Mercedes-Benz?
- Exhaust Leaks
- Faulty Catalyst
- Faulty NOx Sensor
- NOx Sensor harness is open or shorted
- NOx Sensor circuit poor electrical connection
How to Fix the DTC P20EE 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P20EE 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 P20EE Mercedes-Benz code?
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Frequently Asked Questions about P20EE Mercedes-Benz Code
1. What are the common symptoms of OBDII code P20EE (SCR NOx Catalyst Efficiency Below Threshold Bank 1) in a Mercedes-Benz?
- Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.
2. What are the possible causes of OBDII code P20EE in a Mercedes-Benz?
- Possible causes include a malfunctioning Selective Catalytic Reduction (SCR) system, faulty NOx sensor, poor quality DEF fluid, or issues with the exhaust system.
3. How can I diagnose the OBDII code P20EE in my Mercedes-Benz?
- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific fault codes, conducting a visual inspection of the SCR system components, and testing the NOx sensor.
4. Can I drive my Mercedes-Benz with the OBDII code P20EE active?
- It is not recommended to drive your vehicle with an active P20EE code, as it may lead to further damage to the emissions system and affect the vehicle's performance.
5. What are some repair tips for fixing OBDII code P20EE in a Mercedes-Benz?
- Repair tips may include checking and replacing the DEF fluid, inspecting and repairing any damaged wiring or connections, and ensuring proper functioning of the SCR components.
6. How much does it typically cost to repair OBDII code P20EE in a Mercedes-Benz?
- The cost of repairing P20EE can vary depending on the specific underlying issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
7. Can I reset the OBDII code P20EE in my Mercedes-Benz using a simple OBDII scanner?
- While you can clear the code with an OBDII scanner, it is crucial to diagnose and address the root cause of the issue to prevent the code from coming back.
8. Will driving my Mercedes-Benz with the OBDII code P20EE affect emissions compliance?
- Yes, driving with an active P20EE code can lead to increased emissions and may cause your vehicle to fail emissions tests in regions where they are required.
9. How often should I check the DEF fluid level in my Mercedes-Benz to prevent OBDII code P20EE?
- It is recommended to check the DEF fluid level regularly and top it up as needed to ensure proper functioning of the SCR system and prevent issues like P20EE.
10. Is OBDII code P20EE a common problem in Mercedes-Benz vehicles?
- While not extremely common, OBDII code P20EE can occur in Mercedes-Benz vehicles, especially in models equipped with SCR systems designed to reduce emissions.
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