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P0303 Code – Cylinder 3 Misfire Causes, Warning Signs & Easy Fixes


15-02-2026, 07:51. Posted by: carsoftos777



P0303 means the ECU detected combustion problems in Cylinder 3.

Most cases are ignition-related — not major engine failure.


Symptoms


  • Shaking engine

  • Poor acceleration

  • Check engine light

  • Engine hesitation


Why P0303 Happens


Most frequent:

  1. Ignition coil failure

  2. Dirty spark plug

  3. Vacuum leak

  4. Fuel injector issue

  5. Compression problem


PRO Diagnostic Tip


Always check:

  • Fuel trims

  • Misfire counters

  • Live data at idle

This avoids replacing good parts unnecessarily.


Average Repair Cost


Repair Cost
Spark plugs $100–250
Coils $200–400
Injector replacement $300–600


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