P0305 on a Toyota: 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 P0305 means on a Toyota

On a Toyota, P0305 means the engine computer detected a misfire on cylinder 5. That cylinder is not burning fuel cleanly, which wastes gas and can damage the catalytic converter if left alone. Because the code is for one cylinder, the problem is usually on that cylinder's spark plug, ignition coil, or injector.

Is P0305 common on Toyotas?

P0305 appears on Toyota V6 and V8 models like the Camry, Avalon, Highlander, and Tundra, typically at higher mileage. Worn spark plugs are the most common cause, and Toyota recommends replacing them on schedule. Failing ignition coils and clogged injectors come next.

Commonly reported on: Camry, Avalon, Highlander, Tundra.

Symptoms

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

Common causes

most common: Worn or fouled spark plug on cylinder 5
common: Failing ignition coil on cylinder 5
less common: Clogged or leaking fuel injector on cylinder 5
less common: Wiring or connector issue at the coil
less common: Low compression from engine wear

How to fix it

Fix	DIY?	Typical cost
Replace the spark plug on cylinder 5 (or all plugs)	Yes	$40–200
Replace the ignition coil on cylinder 5	Yes	$80–250
Replace or clean the cylinder 5 fuel injector	Mechanic	$200–500
Run a compression test to rule out engine wear	Mechanic	$100–200

Frequently asked questions

What does cylinder 5 mean on a Toyota?

Toyota 4-cylinder engines don't have a cylinder 5. This code comes from V6 and V8 models like the Camry V6, Highlander, and Tundra, where cylinder 5 is one of the rear cylinders.

Is it safe to drive my Toyota with P0305?

If the light is flashing, stop driving because a severe misfire can damage the catalytic converter. A steady light is safer but still deserves a quick diagnosis.

How much does it cost to fix P0305 on a Toyota?

Most fixes run $40–$250. A spark plug or coil replacement is on the low end, while injector or engine work costs more.