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P204F Fault-Error code AdBlue Catalytic Reduction (SCR) system

Updated: Aug 26

P204F Fault-Error Code: Adblue System (Bank 1) Problems and Solutions


P204F Fault-Error code indicates a problem with the Adblue system and is usually linked to the Selective Catalytic Reduction (SCR) system. In this article, we will focus on the meaning, possible causes and long-term effects of the P204F error code. We will also cover the steps to take to resolve this issue.



What is P204F Error Code?


The P204F malfunction/error code is in the OBD-II Diagnostic Trouble Code (DTC) category and indicates a performance issue with the Adblue system. Adblue system is a system used to reduce nitrogen oxide (NOx) emissions in diesel vehicles. Code P204F stands for Reductive System Performance.


P204F

P204F fault/error code Possible Causes and Solutions


  1. Low AdBlue Liquid Level:

  • Solution: Check the AdBlue tank and add the appropriate amount of AdBlue liquid if necessary.

  1. Defective AdBlue Injector:

  • Solution: Check AdBlue injector; In case of blockage or malfunction, clean or replace.

  1. Sensor Malfunction:

  • Solution: Check sensors in AdBlue system; Replace the faulty ones.



  1. Exhaust System Leaks:

  • Solution: Check for leaks within the exhaust system and make repairs if necessary.

  1. Software or Controller Problems:

  • Solution: Check the AdBlue system control unit; If there are software or hardware problems, contact the authorized service for correction.

  1. Using Low Quality AdBlue:

  • Solution: Use high quality AdBlue with specifications recommended by the vehicle manufacturer.

  1. Wiring and Connector Problems:

  • Solution: Check the wiring and connectors related to the AdBlue system; Repair or replace damaged ones.

  1. Other System Faults:

  • Solution: Examine other potential faults with the SCR system and make repairs if necessary.



Symptoms of P204F malfunction/error code


  • Warning Lights: Check Engine Light (CEL) or AdBlue system warning lights may come on.

  • Reduced Engine Power: The vehicle may go into low power mode.

  • AdBlue Level Warning: Warning messages may appear if the AdBlue liquid level is low or empty.

  • Startup Error: In serious cases, the vehicle may be prevented from starting.

  • Poor Performance: A general decrease in engine performance may occur.



P204F malfunction/error code Long Term Effects


  1. Increased Emissions:

  • Failure to resolve the problem may result in an increase in emission levels.

  1. Catalytic Converter Damage:

  • High NOx levels can have adverse effects on the catalytic converter.

  1. Reduced Fuel Efficiency:

  • A faulty Adblue system may negatively affect fuel economy.

  1. Failure to Comply with Emission Standards:

  • The vehicle may not meet established emission standards.



  1. Increased Repair Costs:

  • Failure to promptly resolve the problem may lead to more complex and expensive repairs.

  1. Low Engine Performance:

  • There may be a continuous decrease in the overall performance of the engine.

  1. Potential Vehicle Inoperability:

  • In severe cases, the vehicle may stop working.

  1. Legal Consequences:

  • Failure to comply with environmental regulations can lead to legal problems.



When encountering fault/error code P204F, it is important to resolve the problem immediately and prevent long-term effects. In this case, the best step would be to consult the vehicle's service manual or contact an authorized service. Remember that Adblue system problems can have serious consequences, so it is important not to neglect the problem.

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