P0301 means cylinder 1 misfire detected. Cylinder 1 isn't firing properly. The engine computer pinpointed the exact cylinder, which makes diagnosis faster — it's
Drive gently and get it diagnosed within days.
Cylinder 1 isn't firing properly. The engine computer pinpointed the exact cylinder, which makes diagnosis faster — it's usually the spark plug, coil, or injector for that cylinder.
Swap the plug first — cheapest fix.
A common failure; swapping coils between cylinders confirms it.
Cylinder 1 isn't getting enough fuel.
Worn rings or valves — less common but serious.
Lean condition isolated to one cylinder.
Typically $100–$500
Single plug/coil typically $100–$300; injector service typically $150–$400. Estimates vary by vehicle. Costs are estimates and vary by vehicle, location, and shop.
Safe to drive short distances, but get it fixed within days — a misfiring cylinder dumps raw fuel into the exhaust and can damage the catalytic converter.
Typically $100–$500. Single plug/coil typically $100–$300; injector service typically $150–$400. Estimates vary by vehicle.
Drive gently and get it diagnosed within days.
The most common cause is worn spark plug in cylinder 1. Swap the plug first — cheapest fix.