P204A

Symptoms

• Check Engine light comes on
• Reduced engine power
• Increased fuel consumption
• Increased NOx emissions
• SCR system fault message on the dashboard

Causes

• Reductant pressure sensor malfunction
• Open or short circuit in the sensor circuit
• Poor contact in sensor connectors
• Problems with the engine control unit (ECU)
• Contamination or damage to the reductant pipelines

How to Fix

1. Check the integrity of the reducer pressure sensor circuit
2. Inspect connectors and connections for corrosion or damage
3. Check the functionality of the pressure sensor
4. If necessary, replace the reducer pressure sensor
5. Check and clean SCR system pipelines

Related codes

Error P204A by Vehicle Brand