P20AD

Symptoms

• Check Engine light comes on
• Reduced engine power
• Increased fuel consumption
• Unpleasant exhaust smell
• Possible AdBlue system error messages

Causes

• Malfunction of the urea injection unit temperature sensor
• Open or short circuit in the sensor circuit
• Poor contact in sensor circuit connectors
• Problems with the SCR control unit
• Contamination or damage to the urea injection unit

How to Fix

1. Check the continuity of the temperature sensor circuit
2. Check sensor connectors and connections
3. Check the resistance of the temperature sensor
4. If necessary, replace the temperature sensor
5. Check and, if necessary, replace the urea injection unit

Related codes

Error P20AD by Vehicle Brand