P25D6

Symptoms

• Deterioration of the interior heating system
• Increased fuel consumption
• Check Engine Light Is On
• Reduced engine power
• Unstable engine operation at idle

Causes

• Bypass valve position sensor malfunction
• Mechanical valve sticking
• Open or short circuit in the sensor circuit
• Poor contact in the sensor connector
• Problems with the engine control unit

How to Fix

1. Check the condition of the bypass valve and its mechanical operation
2. Check the electrical circuit of the position sensor
3. Check sensor connectors and connections
4. Replace faulty position sensor
5. If necessary, replace the bypass valve

Related codes

Error P25D6 by Vehicle Brand