P0302 Cylinder 2 Misfire Detected

P0302 indicates a detected misfire on cylinder 2. The diagnostic value is the cylinder location, which lets you compare that cylinder against known-good cylinders.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not keep driving with an active cylinder 2 misfire; catalyst damage risk rises when raw fuel reaches the exhaust.

Symptoms of P0302

Rough idle or a distinct shake, often worse at low RPM.
A stumble or dead spot traced to cylinder 2.
A flashing check-engine light when the misfire is active.
Slight power loss and worse fuel economy.

Common causes of P0302

A worn spark plug or failed ignition coil on cylinder 2.
A clogged, leaking, or dead injector on cylinder 2.
A vacuum leak or low compression local to that cylinder.
Carbon-tracked plug boot or damaged coil wiring.

Useful checks before replacing parts

Use misfire counters and freeze-frame data to learn when cylinder 2 misfires.
Check spark output, plug condition, injector control, injector delivery, compression, and cylinder-specific air leaks.
Inspect harness routing and connector fit near cylinder 2 before replacing ignition or injector parts.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.