What is the spark plug sequence for a 2002 ford ranger?

The firing order for a 2002 Ford Ranger depends on the engine. Ford Rangers of that year used several different engines. You must know your engine size (e.g., 2.3L, 2.5L, 3.0L, 4.0L) to determine the correct firing order.

There's no single answer without knowing the engine. To find the correct firing order, consult your owner's manual or look for a sticker under the hood (often near the radiator support). Alternatively, you can search online using "2002 Ford Ranger [engine size] firing order".