P0302 on a Lexus: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

If the check engine light is flashing, stop driving, since a severe misfire can damage the catalytic converter.

What P0302 means on a Lexus

On a Lexus, P0302 means cylinder 2 is misfiring — it is not burning fuel the way it should. Because the code names one specific cylinder, the problem is usually isolated to cylinder 2's spark plug, ignition coil, or fuel injector.

Is P0302 common on Lexuss?

P0302 appears on Lexus models with Toyota-derived engines, such as the ES, RX, IS, and GS. These engines use coil-on-plug ignition, so a single failing ignition coil on cylinder 2 is a common find, and spark plugs wear with mileage just like on other Toyotas.

Commonly reported on: ES, RX, IS, GS.

Symptoms

Check engine light on (flashing if severe)
Rough idle or shaking from the engine
Loss of power or hesitation when accelerating
Poor fuel economy

Common causes

most common: Worn or fouled spark plug in cylinder 2
common: Failing ignition coil on cylinder 2
less common: Clogged fuel injector on cylinder 2
less common: Carbon buildup on intake valves (direct-injection engines)
less common: Low compression from engine wear

How to fix it

Fix	DIY?	Typical cost
Replace the spark plug in cylinder 2, or all of them	Yes	$40–150
Swap the ignition coil to another cylinder to confirm, then replace it	Yes	$80–300
Replace the faulty fuel injector	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 Lexus with a P0302 code?

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

What usually causes P0302 on a Lexus?

A bad spark plug or ignition coil on cylinder 2 is the most common cause. These engines use one coil per cylinder, so a single failing coil is a common find.

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

Spark plugs run about $40–$150 and coils about $80–$300. Injector or carbon-cleaning repairs cost more, typically several hundred dollars.