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What Does P0309 Code Mean?

OBD-II Code P0309 is defined as a Cylinder 9 Misfire Detected

When the engine control module (PCM) detects that cylinder nine is not sufficiently contributing to keeping the engine running properly, it will set code P0309.

P0309 Symptoms

  • Decreased engine performance
  • Increased fuel consumption

Common Problems That Trigger the P0309 Code

  • Damaged or contaminated spark plug
  • Engine sensor failure
  • Exhaust leak
  • Fuel injector failure
  • Fuel pump failure
  • Ignition coil failure
  • Internal engine failure
  • Powertrain Control Module (PCM) software needs to be updated
  • The fuel does not meet the manufacturer's requirements
  • Vacuum leak

Common Repairs Needed for the P0309 Code

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