P203A

Symptoms

• Check Engine Light Is On
• Low reagent message on instrument panel
• Possible engine power limitation
• Increased fuel consumption
• Unpleasant exhaust smell

Causes

• Reagent level sensor malfunction
• Open or short circuit in the sensor circuit
• Poor contact in wiring connectors
• Problems with the SCR control module
• Contamination or crystallization of the reagent on the sensor

How to Fix

1. Check the level and quality of the reagent in the tank
2. Inspect the sensor wiring and connectors for damage
3. Check sensor resistance and reference voltage
4. If necessary, replace the reagent level sensor
5. Reset the error code and check the system

Related codes

Error P203A by Vehicle Brand