The P206B code is part of the OBD-II diagnostic system and relates to the performance of the reductant quality sensor circuit. This code indicates that the engine control module (ECM) has detected a problem with the sensor’s ability to monitor the use of Diesel Exhaust Fluid (DEF) in the vehicle’s emissions control system.
What Does the P206B Code Mean?
The P206B code signifies that the reductant quality sensor circuit is reporting a range or performance issue. The engine computer uses this sensor to ensure that DEF is being used correctly in the Selective Catalytic Reduction (SCR) system to reduce harmful nitrogen oxides (NOx) emissions.
What Causes the P206B Code?
- DEF contamination
- Reductant quality sensor failure
- Selective Catalytic Reduction (SCR) system failure
- Wiring issues in the sensor circuit
What Are the Symptoms of the P206B Code?
Symptoms associated with the P206B code may include:
- Check Engine Light illuminated
- DPF (Diesel Particulate Filter) regeneration may not occur
- Decreased engine performance
- Increased emissions
How Serious Is the P206B Code?
The P206B code is considered urgent. Ignoring this code can lead to significant damage to the vehicle’s emissions system or other components, and may even compromise the safety of the driver and passengers.
How to Diagnose the P206B Code
Diagnosing the P206B code typically involves the following steps:
- Use an OBD-II scanner to confirm the presence of the code.
- Inspect the wiring and connectors for the reductant quality sensor for any signs of damage or corrosion.
- Check the DEF for contamination.
- Test the reductant quality sensor to ensure it is functioning correctly.
- Examine the SCR system for any faults.
Common Repairs for the P206B Code
Repairs for the P206B code may include:
- Replacing the reductant quality sensor
- Repairing or replacing damaged wiring or connectors
- Cleaning or replacing contaminated DEF
- Addressing issues within the SCR system
How Much Does It Cost to Fix the P206B Code?
The cost to fix the P206B code can vary significantly based on the specific problem and the make and model of the vehicle. Generally, repairs can range from $100 to $1,500, depending on whether you need to replace the sensor, repair wiring, or service the SCR system.
Can I Fix the P206B Code Myself?
While some aspects of diagnosing and repairing the P206B code can be managed by a knowledgeable DIYer, such as checking wiring and replacing the sensor, it is recommended to consult with a professional mechanic for a thorough diagnosis and repair, especially if the SCR system is involved. Proper tools and expertise are necessary to ensure that the repair is done correctly, avoiding further complications.
