P0302 on a Honda: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

If the check engine light is flashing, stop driving — a severe misfire can damage the catalytic converter. A steady light is usually safe for a short drive to a shop.

What P0302 means on a Honda

On a Honda, P0302 means the engine computer has detected that cylinder 2 is not firing properly and is failing to contribute its share of power. Because the code names one cylinder, the fault is usually specific to cylinder 2, such as its spark plug, ignition coil, or fuel injector.

Is P0302 common on Hondas?

P0302 is common on higher-mileage Hondas, especially the Civic, Accord, and CR-V with 1.5L turbo and 2.0L or 2.4L engines. Honda's iridium spark plugs last a long time but eventually wear out, and coil-on-plug ignition coils can fail with age. Swapping the coil from cylinder 2 with another cylinder is a fast way to confirm the diagnosis.

Commonly reported on: Civic, Accord, CR-V, Pilot.

Symptoms

Check engine light on (flashing if severe)
Rough idle or shaking at a stop
Loss of power or hesitation under acceleration
Poor fuel economy

Common causes

most common: Worn or fouled spark plug in cylinder 2
common: Failing ignition coil for cylinder 2
common: Clogged or leaking fuel injector in cylinder 2
less common: Vacuum leak near the intake
less common: Low compression in cylinder 2 from engine wear

How to fix it

Fix	DIY?	Typical cost
Replace the spark plug in cylinder 2	Yes	$30–120
Replace the ignition coil for cylinder 2	Yes	$80–300
Clean or replace the fuel injector in cylinder 2	Mechanic	$150–600
Run a compression test to rule out internal engine wear	Mechanic	$100–200