A misfire happens when one or more cylinders in your vehicle are not working. A misfire is in most cases followed by the engine shaking and in some cases very little response when pressing the gas pedal.

Newer vehicles go in limp mode which limits speed to max 40 mph and transmission stays in one gear. 

Common Causes 

  • Worn spark plugs
  • Defective ignition coil
  • Dirty Mass Air Flow (MAF) sensor
  • Clogged catalytic converter
  • Blown head gasket
  • Engine Control Unit (ECU) malfunction

It is not recommended to drive the vehicle for an extended time when a misfire is present.

Misfires can cause damage to other engine parts, like the oxygen sensors and catalytic converters to fail.

Diagnostic Trouble Codes

When reading fault codes with an OBD-II scanner, one or more of the following fault codes will be present. 

P0300, P0301, P0302, P0303, P0304, P0305, P03066

Keyword: OBD2 scanner

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