A flashing light means stop driving when safe — raw fuel is reaching the catalytic converter. With a steady light, limit driving and get it diagnosed; a single dead cylinder puts noticeable extra load on the rest of the engine.
Combustion is failing in cylinder 1 specifically. A single-cylinder misfire is the easier case to chase, because everything the cylinder does not share with its neighbours becomes a suspect: its own plug, its own coil, its own injector, its own valves and rings. The standard first move is to swap the coil with an adjacent cylinder and clear the code — if the misfire follows the coil to cylinder 2, the coil is the fault, and no parts have been bought to prove it.
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
A cylinder-specific misfire code has already done half the diagnosis for you: the problem lives in, or is delivered to, cylinder one. That collapses the suspect list to that cylind...
Sign in or create an account to add what you found about P0301.