Navigation

Top News

  • E OBD2 Facile 3.83.1155 Full
  • Obd Mary 1.291 Full
  • PETKA 8.8 03.2026 (1643) + VIN database 3020555 pcs. Full
  • OBDeleven 0.104.0 Full
  • ECU Repair Help E-Book 2022
  • GM NAO TIS 2000 Full
  • JLR Pathfinder Offline v374 [2023] Full
  • MMC ASA All Regions (May 2024) 1.8.0.0 [Multi]
  • E OBD2 Facile 3.84.1158 Full
  • Information on immobilizers for various cars from the 2000s

    • Statistics

    Advertisement

    СarSoftos.com » OBD2 Error Codes » P0303 Code – Cylinder 3 Misfire Causes, Warning Signs & Easy Fixes

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

    Author: carsoftos777 | 15-02-2026, 07:51 | OBD2 Error Codes | Views: 11 | Comments: 0 | Found a bug?



    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


    • LIKE
    • 1

    Tags:
    To return
  • Engine Shaking? P0301 Cylinder 1 Misfire – Causes, Fixes & Repair Cost
  • P0302 Cylinder 2 Misfire Explained – Why Your Engine Runs Rough
  • P0300 Code – Random / Multiple Cylinder Misfire (Meaning, Causes, Symptoms & Fix)
  • Top 10 Most Common OBD2 Error Codes (And What They Really Mean)
  • P0442 Code – EVAP System Small Leak Detected | Meaning, Causes, Symptoms & Fix
    • Information
    Users of Guests are not allowed to comment this publication.