P0302 on a Nissan: 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 Nissan

On a Nissan, P0302 means the engine computer has detected that cylinder 2 is not firing properly and is failing to contribute its share of power. Because it is a single-cylinder code, the fault is usually confined to cylinder 2 itself, like its spark plug, ignition coil, or fuel injector.

Is P0302 common on Nissans?

P0302 is common on Nissan four-cylinders like the 2.5L QR25DE in the Altima and Rogue and the smaller engines in the Sentra. Nissan ignition coils are a frequent wear item at higher mileage, and spark plugs eventually need replacing too. A simple coil swap test between cylinders usually pinpoints the bad part.

Commonly reported on: Altima, Sentra, Rogue, Pathfinder.

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

Frequently asked questions

Is it safe to drive my Nissan with a P0302 code?

Only if the light is steady and the car runs fine. A flashing light means a severe misfire, so stop driving and get it towed.

Why does my Nissan misfire on cylinder 2?

The spark plug, ignition coil, or fuel injector for that cylinder is usually the problem. Nissan coils and plugs wear out over time, especially on higher-mileage Altimas and Rogues.

How much does it cost to fix P0302 on a Nissan?

A spark plug is the cheapest fix, usually under $150. A coil costs more, and a fuel injector is the most expensive of the three.