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Fault code guide

P0303: Cylinder 3 Misfire Detected

Plain English for owners who are not mechanics. We show where each answer comes from, and we say so when it is not known.

What the dictionary says

Cylinder 3 Misfire Detected

Source: generic entry in the MIT-licensed dtc-database · view source file

P0303 is a generic OBD fault code. The fault-code dictionary we use defines it as "Cylinder 3 Misfire Detected". Below: the source entry, manufacturer entries, related codes and the terms explained.

Manufacturer entries in the dictionary

  • Audi

    Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems)

    Source file · Listed as written in this source file. Not ranked; a workshop must confirm what applies to your car.

Reading the code P0303

  • First character: P: Powertrain (engine, transmission and ignition)
  • Second character: 0: a generic code defined by SAE, meant to mean the same thing on every make
  • Last three characters: 303: The specific fault within that category.

Reference: On-board diagnostics (Wikipedia)

Terms in this code

  • Mass air flow (MAF) sensor: A sensor that measures the mass of air entering a fuel-injected engine. More
  • EGR (exhaust gas recirculation): A system that sends part of the exhaust gas back into the engine to reduce nitrogen oxide (NOx) emissions. More

Related codes

  • P0300 Random/Multiple Cylinder Misfire Detected
  • P0301 Cylinder 1 Misfire Detected
  • P0302 Cylinder 2 Misfire Detected
  • P0304 Cylinder 4 Misfire Detected

Singapore notes

LTA's periodic inspection checks a car's exhaust emissions and noise against the prevailing standards, as well as brakes, steering, lights and structure. Cars under 3 years old have no periodic inspection, cars aged 3 to 10 years are inspected every 2 years, and cars over 10 years every year. The dictionary does not say how this code affects an inspection, so ask the inspection centre or a workshop. LTA: vehicle inspection

Need a workshop? See workshops owners recommend or the Subaru list.

What this page does not tell you

The dictionary does not establish repair costs, how likely each cause is, or whether the car is safe to drive. Get a workshop diagnosis and a written quote before paying for parts.

For a make-specific answer, use the lookup below with your make and model. The dictionary has 93 Subaru-specific entries among 18,805 in total.

Look up P0303 for your car

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