P0303

2017-10-10

Description:

  • The fault code P0303 indicates that the Engine Control Module (ECM) detected a misfire in cylinder 3. This misfire can cause damage to the engine and lead to reduced performance.

Possible Symptoms:

  • Engine misfires or runs erratically

  • Illuminated check engine light

  • Reduced engine power or acceleration

  • Rough idle or stalling

Possible Causes:

  • Faulty spark plug in cylinder 3

  • Bad ignition coil in cylinder 3

  • Clogged or dirty fuel injector in cylinder 3

  • Low compression in cylinder 3

  • Vacuum leak in cylinder 3

  • Faulty Engine Control Module (ECM)

Related Parts:

  • Crankshaft Position Sensor: The crankshaft position sensor monitors the position of the crankshaft to regulate fuel injection. Problems lead to engine misfire and engine stalling

Possible Solutions:

  • Replace spark plug in cylinder 3

  • Replace ignition coil in cylinder 3

  • Clean or replace fuel injector in cylinder 3

  • Check and repair any issues with compression in cylinder 3

  • Check for and repair any vacuum leaks in cylinder 3

  • Replace the Engine Control Module (ECM) if necessary

Search