P1398
Misfire Adaptive Numerator At Limit Condition
Severity
🔴 HighCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Unstable engine idling
- Power Loss
- Increased fuel consumption
- Jerking during acceleration
- Check Engine Light Illuminates
Causes
- Faulty spark plugs
- Problems with ignition coils
- Low fuel pressure
- Dirty or faulty fuel injectors
- Problems with the intake system (air leaks)
How to Fix
- Check the condition of the spark plugs and replace if necessary.
- Diagnose ignition coils
- Check fuel pressure and condition of the fuel pump
- Clean or replace fuel injectors
- Check the tightness of the intake system