P1304
Cylinder 4 Misfiring Detected
Severity
⚠️ MediumCan you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)
Symptoms
- The engine runs rough or shakes
- Power Loss
- Increased fuel consumption
- Check Engine Light Is On
- Popping sounds in the exhaust system
Causes
- Faulty spark plugs
- Problems with the ignition coil
- Clogged fuel injectors
- Low cylinder compression
- Problems with sensors (mass air flow sensor, crankshaft position sensor)
How to Fix
- Check the condition of the spark plugs in cylinder 4
- Check ignition coil and wires
- Clean or replace fuel injector
- Check compression in cylinder
- Check the operation of engine sensors