How to Diagnose and Fix P204F Engine Code – OBD II Trouble Code Explained

In this article, we’ll explain the meaning of error code P204F and guide you through diagnosing and fixing it.

What Does P204F Mean?

OBD-II fault code P204F indicates a problem with the Reductant System, which is responsible for reducing emissions. A malfunction here can lead to issues with DPF regeneration. When this code is triggered, your vehicle will likely exhibit the following symptoms:

  1. Check Engine Light is illuminated
  2. Reduced fuel economy

Possible Causes

Now, let’s go over some potential causes and how you can diagnose and fix them:

  1. Faulty Reductant System Sensor
    • Use an OBD-II scanner to check for any additional codes.
    • Inspect the reductant system sensor for physical damage or corrosion.
    • Test the sensor’s resistance with a multimeter to ensure it is within the manufacturer’s specifications.
    • Fix: Replace the reductant system sensor if it’s damaged or out of spec.
  2. Clogged Diesel Particulate Filter (DPF)
    • Inspect the DPF for signs of clogging or damage.
    • Perform a backpressure test to check if the DPF is restricting exhaust flow.
    • Fix: Clean or replace the DPF as necessary to restore proper function.

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