P0309

Symptoms

• Engine troubles
• Power Loss
• Increased fuel consumption
• Unstable idle
• Jerking during acceleration

Causes

• Faulty spark plug
• Problems with the ignition coil
• Fuel injector malfunction
• Low cylinder compression
• Problems with sensors (mass air flow sensor, knock sensor)
• Vacuum leak
• Malfunction of the variable valve timing (VVT) system

How to Fix

1. Check the condition of the spark plug in cylinder 9
2. Check the ignition coil
3. Check the operation of the fuel injector
4. Measure the compression in the cylinder
5. Check the condition of the wiring harness
6. Check the operation of the sensors (mass air flow sensor, knock sensor)
7. Check the intake manifold for leaks
8. Check VVT system

Related codes

Error P0309 by Vehicle Brand