Trouble code explained

P0302: Cylinder 2 misfire

P0302 means the engine controller detected a misfire associated with cylinder 2. Combustion in that cylinder was not producing the expected contribution. The code identifies the cylinder involved in the detected event; it does not explain why it happened.

P0302

By Under The Hood Nation · Published

What P0302 means

Verified description: Cylinder 2 Misfire Detected

General OBD-II powertrain explanation for vehicles that support this code. The practical context here focuses on gasoline engines. Library coverage does not establish UTH Scanner compatibility with a vehicle or module.

Vehicle-specific limits

  • Cylinder 2 is the manufacturer-numbered cylinder, not necessarily the second cylinder in firing order or the second one from the front. Confirm its location for your engine.
  • Use the complete code, any manufacturer suffix and its current status. Misfire thresholds and diagnostic tools differ across engines.

What the code does and does not tell you

What it establishes

  • The misfire monitor assigned the fault to cylinder 2.

What it does not establish

  • That a new spark plug will cure it. Fuel, ignition and mechanical problems require different evidence.
  • That the fault is continuously present or that another cylinder is necessarily healthy.

How urgent is it?

Treat a flashing check-engine light or severe shaking as urgent. Reduce load and seek assistance; stop somewhere safe if power loss or other symptoms make driving unsafe. Code P0302 alone cannot certify that the vehicle is safe to drive.

Symptoms you may notice

  • The engine may feel uneven or shake when the problem occurs.
  • A warning may appear even when the engine feels normal during a later check.

Possible causes

  • An ignition fault, injector/fuel problem or inadequate compression can affect one cylinder.
  • The useful distinction is which test separates those possibilities, rather than which part is easiest to replace.

A possibility is not a diagnosis. Confirm the cause with the vehicle-specific testing procedure before replacing parts.

Sensible next checks

  1. Keep the code report and note recent service, refueling and the conditions when the engine felt different.
  2. Read P0302 together with P0300 or other cylinder codes if present; do not treat each code as a separate shopping list.
  3. Ask a technician to confirm the misfiring cylinder and test its ignition, fuel delivery and mechanical contribution using the correct service procedure.

When to get professional help

A repeat cylinder-specific fault deserves inspection, especially after an unsuccessful parts replacement. Preserve the original and current evidence so the next test can be chosen sensibly.

Related codes

Sources and review

Prepared from the sources listed below and approved for publication by UTH. No qualified mechanic review or vehicle testing is claimed.

Sources checked . Source checking is separate from qualified human review.

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