P050B

Symptoms

• Unstable engine idling
• Increased fuel consumption
• Difficult cold start
• Reduced engine power

Causes

• Coolant temperature sensor malfunction
• Problems with the knock sensor
• Contamination or malfunction of the air flow sensor
• Worn spark plugs or coils
• Mechanical engine problems (eg low compression)

How to Fix

1. Check and, if necessary, replace the coolant temperature sensor
2. Diagnose the knock sensor
3. Clean or replace the mass air flow sensor
4. Check the condition of the spark plugs and coils
5. Check compression in cylinders

Related codes

Error P050B by Vehicle Brand