WELLS Engine Management Systems
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Trouble Codes

Trouble Code Search

Enter a trouble code. (For example, "P1192", "P0101")

Is this a GM vehicle?

Results for "P0304"

CodeVehicle MakeModel YearVehicle Model / Engine SizeExplanation
P0304

Cylinder misfire detected-Cylinder number 4
   – The powertrain control module monitors the crankshaft speed and has detected a misfire condition

Probable Cause[s]

  1. Ignition system fault-spark plug(s), ignition wires, coil
  2. Vacuum leak
  3. injector fault
  4. high or low fuel pressure
P0304BMW

Cylinder 4 Misfire Condition
   – Ignition system fault

Probable Cause[s]

  1. Plugged or faulty fuel injector
  2. Vacuum leak
  3. Engine mechanical condition
P0304Honda

Cylinder Number 4 Misfire Detected
   –

Probable Cause[s]

  1. Vacuum leak affecting one cylinder
  2. Ignition system concern
  3. Blocked/Faulty Fuel Injector
  4. Engine mechanical condition
P0304Infiniti

Number 4 Cylinder Misfire Detected
   –

Probable Cause[s]

  1. Fuel system malfunction
  2. Ignition system fault
  3. Large vacuum leak
  4. Engine mechanical condition
P0304Kia

Cylinder 4 Misfire Detected
   –

Probable Cause[s]

  1. Rich or lean air/fuel mixture
  2. Ignition system fault
  3. Fuel injector fault
  4. Engine mechanical fault
P0304Lexus

Cylinder 4 Misfire Detected
   –

Probable Cause[s]

  1. Large vacuum leak
  2. Fuel system concern
  3. Ignition system concern
  4. Engine mechanical condition
P0304Mazda

Cylinder 4 misfire condition detected
   –

Probable Cause[s]

  1. Lean air/fuel ratio
  2. Weak ignition system
  3. Engine mechanical condition
  4. Vacuum leak affecting one cylinder
P0304Mitsubishi

Cylinder 4 Misfire Condition
   –

Probable Cause[s]

  1. Ignition system faulty
  2. Fuel system faulty- Injectors or pressure
  3. Vacuum leak
  4. Engine mechnical condition
P0304Nissan

Number 4 cylinder misfire detected
   –

Probable Cause[s]

  1. Ignition system fault
  2. Fuel system fault
  3. Vacuum leak affecting one cylinder
  4. Engine mechanical condition
P0304Subaru

Cylinder 4 Misfire Detected
   –

Probable Cause[s]

  1. Leaking or blocked injector
  2. Ignition system malfunction affecting one cylinder
  3. Engine mechanical condition
  4. Valve adjustment needed
P0304Toyota

Cylinder 4 misfire detected
   –

Probable Cause[s]

  1. Weak/missing spark
  2. Plugged fuel injector
  3. Engine mechanical fault
  4. Large vacuum leak specific to cylinder
P0304Volkswagen

Cylinder 4 Misfire Condition
   – Vacuum leak on engine

Probable Cause[s]

  1. Ignition system fault
  2. Fuel injector fault
  3. Engine mechnical condition