P20F3 Code - SCR NOx Pre-Catalyst Efficiency Below Threshold Bank 2
Quick Answer
The diagnostic trouble code P20F3 indicates that the Selective Catalytic Reduction (SCR) system's NOx (nitrogen oxide) pre-catalyst efficiency is below the threshold on Bank 2 of the engine. Common causes include Faulty NOx sensor, Malfunctioning SCR injector, Clogged or damaged pre-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
- P20F3 indicates SCR NOx Pre-Catalyst Efficiency Below Threshold Bank 2.
- Common causes
- Common causes include Faulty NOx sensor, Malfunctioning SCR injector, Clogged or damaged pre-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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P20F3 Description
The diagnostic trouble code P20F3 indicates that the Selective Catalytic Reduction (SCR) system's NOx (nitrogen oxide) pre-catalyst efficiency is below the threshold on Bank 2 of the engine. The SCR system is an emissions control technology that uses diesel exhaust fluid (DEF) to reduce NOx emissions in diesel engines. The pre-catalyst is responsible for converting harmful nitrogen oxides into less harmful substances before they reach the main catalytic converter. When the efficiency of the pre-catalyst falls below the specified threshold, it signifies that the system is not effectively reducing NOx emissions, leading to increased pollution levels.
Common Causes of P20F3
- Faulty NOx sensor
- Malfunctioning SCR injector
- Clogged or damaged pre-catalyst
- DEF system malfunction
- Poor quality or contaminated DEF fluid
Symptoms of P20F3
- Check engine light illuminated
- Reduced engine performance or power loss
- Increased fuel consumption
- Failed emissions test
- Strong exhaust odor or smoke
How to Fix P20F3
- Diagnose the issue using a scan tool to pinpoint the exact cause of the problem.
- Inspect the NOx sensor, SCR injector, and pre-catalyst for any signs of damage or clogging.
- Replace the faulty component, whether it is the sensor, injector, or pre-catalyst.
- Flush and refill the DEF system with high-quality, clean DEF fluid.
- Clear the error codes and reset the system to ensure proper functionality.
Cost to Fix P20F3
The typical repair cost for addressing a SCR NOx pre-catalyst efficiency below threshold issue can range from $500 to $1500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate. Labor rates at auto repair shops typically range between $80 and $150 per hour, with rates potentially higher at dealerships or metropolitan areas and lower at independent shops.
Need more information about the P20F3 code?
Need more information on how to fix the P20F3 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P20F3 code diagnosed by a professional: Find a repair shop in your area
Code P20F3 Information for Specific Makes
- P20F3 Dodge — SCR NOx Pre-Catalyst Efficiency Below Threshold Bank 2
- P20F3 Ford — SCR NOx Pre-Catalyst Efficiency Below Threshold Bank 2
Frequently Asked Questions about P20F3 Code
No Frequently Asked Questions about P20F3 Code found.
Discuss the causes and fixes for P20F3 OBDII Code
Code P20F3 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.