TORKO

P0302 Cylinder 2 misfire detected

What P0302 means

The engine computer detects misfires from small dips in crankshaft speed and can identify which cylinder caused them. P0302 means cylinder 2 is not burning its fuel properly. This raises emissions, makes the engine run roughly and can damage the catalytic converter if it continues.

P0302 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.

At a glance

Severity
High
Typical repair cost
40–400 €
Workshop time
0.3–4 h
Repair difficulty
Easy
DIY possible
Yes
Check engine light
Yes
Affects emissions test
Yes

Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.

Symptoms

Common causes

  1. Worn or fouled spark plug in cylinder 2
  2. Faulty ignition coil for cylinder 2
  3. Clogged or faulty injector for cylinder 2
  4. Vacuum leak near cylinder 2
  5. Low compression in cylinder 2

Can I keep driving with P0302?

Have it checked today or tomorrow. If the check engine light flashes, avoid driving, as the catalytic converter can overheat.

What to check first

  1. Swap the cylinder 2 coil with another cylinder, clear codes and see if the misfire follows
  2. Inspect and replace the spark plug if worn or fouled
  3. Check the injector wiring and operation for cylinder 2
  4. Do a compression test if ignition and fuel are good

Related codes

Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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