P0300 P0302 multiple cylinder misfire cylinder 2 misfire detective

P0300 multiple cylinder misfire P0302 cylinder 2 misfire detective

The trouble codes you're seeing—P0300 and P0302—point to engine misfires:

P0300: Random/Multiple Cylinder Misfire Detected

P0302: Cylinder 2 Misfire Detected

This means you're getting a general misfire across multiple cylinders (P0300), but especially in cylinder 2 (P0302).

Common Causes:

Ignition Issues:

Faulty spark plug in cylinder 2

Faulty ignition coil or coil pack

Worn spark plug wires (if applicable)

Fuel Issues:

Clogged or failing fuel injector on cylinder 2

Low fuel pressure

Dirty or failing fuel filter

Air Issues:

Vacuum leak near cylinder 2

Dirty or faulty MAF sensor

Mechanical Problems:

Low compression in cylinder 2

Valve problems

Head gasket issues

Other:

Bad ECU or engine control issues

Grounding issues or damaged wiring to the coil/injector

Recommended Steps:

Start with cylinder 2:

Swap the spark plug with another cylinder and see if the misfire code changes (e.g., becomes P0303 for cylinder 3).

Do the same with the ignition coil.

Inspect wiring and connectors to the coil and injector on cylinder 2.

Scan live data if you have a scanner to look at fuel trims and misfire counters.

Perform a compression test if everything else checks out.

Want help walking through the diagnosis? Let me know your vehicle's year, make, model, and engine type—I'll tailor the steps for you.