P20F2 Code - SCR NOx Catalyst Efficiency Below Threshold Bank 2
Quick Answer
The Selective Catalyst Reduction (SCR) catalyst is monitored to ensure it is capable of NOx conversion. Common causes include Faulty NOx Sensor, Diesel Exhaust Fluid, Faulty Selective Catalyst Reduction (SCR) Catalyst. 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
- P20F2 indicates SCR NOx Catalyst Efficiency Below Threshold Bank 2.
- Common causes
- Common causes include Faulty NOx Sensor, Diesel Exhaust Fluid, Faulty Selective Catalyst Reduction (SCR) Catalyst.
- 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 P20F2 Description
The reductant, Diesel Exhaust Fluid (DEF), which is used as part of the SCR catalyst reaction, is monitored to ensure the tank is not refilled with an improper reductant. Upon detection of a refill event, the monitor is activated. After the SCR Catalyst Efficiency Monitor has completed and the SCR has been determined to be functional, the efficiency monitor continues to calculate the cumulative efficiency of the system. Each subsequent value for cumulative efficiency is included in two filtering routines, one for short term efficiency and the other for long term efficiency. If the difference between the two filtered efficiencies becomes greater than a threshold, a fault is indicated. the short term efficiency needs to be less than 0.20 and the delta between short and long term efficiency needs to be greater than 0.10.
What are the Possible Causes of the DTC P20F2?
- Faulty NOx Sensor
- Diesel Exhaust Fluid
- Faulty Selective Catalyst Reduction (SCR) Catalyst
How to Fix the DTC P20F2?
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 P20F2 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.
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Information for Specific Makes
- P20F2 Dodge — SCR NOx Catalyst Efficiency Below Threshold Bank 2
- P20F2 Ford — SCR NOx Catalyst Efficiency Below Threshold Bank 2
Frequently Asked Questions about P20F2 Code
1. What are common symptoms of OBDII code P20F2 (SCR NOx Catalyst Efficiency Below Threshold Bank 2)?
- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.
2. What are the possible causes of OBDII code P20F2?
- The code P20F2 can be caused by issues such as a faulty NOx sensor, a malfunctioning SCR catalyst, exhaust leaks, or contaminated DEF (diesel exhaust fluid).
3. How serious is the OBDII code P20F2?
- This code indicates a problem with the SCR NOx catalyst efficiency, which is crucial for controlling harmful emissions. It should be addressed promptly to prevent further damage to the vehicle's emission system.
4. How can I diagnose OBDII code P20F2?
- Diagnosing this code typically involves using a scan tool to retrieve the code, checking the NOx sensor readings, inspecting the SCR catalyst, and testing the DEF quality.
5. Can I continue driving with OBDII code P20F2?
- It is not recommended to continue driving with this code as it can lead to increased emissions and potential damage to the vehicle's emission control system.
6. What are the repair options for OBDII code P20F2?
- Repair options may include replacing the NOx sensor, cleaning or replacing the SCR catalyst, repairing exhaust leaks, or flushing and refilling the DEF tank.
7. How much does it cost to fix OBDII code P20F2?
- The cost of fixing this code can vary depending on the specific issue causing it. Repair costs may range from a few hundred to over a thousand dollars, including parts and labor.
8. How can I prevent OBDII code P20F2 from recurring?
- To prevent the recurrence of this code, it's important to maintain regular vehicle maintenance, use high-quality DEF, and address any potential issues with the emission system promptly.
9. Can I reset OBDII code P20F2 on my own?
- While you can clear the code with a scan tool, it's important to diagnose and address the underlying issue causing the code to prevent it from reoccurring.
10. Will OBDII code P20F2 cause my vehicle to fail an emissions test?
- Yes, vehicles with this code may fail emissions testing due to excessive NOx emissions, which can result in a failed inspection.
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