Drivable short-term, but fix now to avoid damage.
P0302 means the engine computer detected a misfire in cylinder number 2. That cylinder isn't igniting its air-fuel mixture properly, causing a power loss and rough running. Since it's specific to one cylinder, the usual culprit is a worn ignition or fuel part serving cylinder 2.
$80 – $450
Varies by vehicle and root cause.
Briefly and gently, yes, but not long-term. If the light is flashing, stop driving and get a tow to avoid catalytic converter damage.
Usually $80-$300 for a spark plug or coil on cylinder 2 including labor. Injector or compression issues can raise the cost toward $450 or more.
It can be, because an ongoing misfire can overheat and ruin the catalytic converter. Fixing it promptly keeps a cheap repair from becoming an expensive one.
Sometimes a coil or plug fails after being swapped. If the misfire follows a part when you move it from cylinder 2 to another spot, that part is the problem.