OBD Guide
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P1398

Misfire Adaptive Numerator At Limit Condition

P1398 is an OBD-II diagnostic trouble code meaning: Misfire Adaptive Numerator At Limit Condition. Common causes: faulty spark plugs, problems with ignition coils. Estimated repair cost: $17–89.

Severity
🔴 High
Can 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

  1. Check the condition of the spark plugs and replace if necessary.
  2. Diagnose ignition coils
  3. Check fuel pressure and condition of the fuel pump
  4. Clean or replace fuel injectors
  5. Check the tightness of the intake system

Related codes

P0300P0301P0302P0303

Error P1398 by Vehicle Brand

BuickCadillacChevroletChryslerDodgeGMGMCJaguarJeepOldsmobilePlymouthPontiacSaturnVolkswagen

FAQ

What does the P1398 code mean?

P1398 is an OBD-II diagnostic trouble code that indicates: Misfire Adaptive Numerator At Limit Condition

What causes a P1398 error code?

The most common causes of P1398 include: Faulty spark plugs; Problems with ignition coils; Low fuel pressure; Dirty or faulty fuel injectors.

How do I fix a P1398 diagnostic trouble code?

To fix P1398: Check the condition of the spark plugs and replace if necessary.. Diagnose ignition coils. Check fuel pressure and condition of the fuel pump. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1398?

Limited driving only, diagnose soon

How much does it cost to fix P1398?

The estimated repair cost for P1398 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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