If you are under the car. Look to the rear of the engine and you will see a bolt (I think that it is a 19mm) in the oil pan.
bottom of the radiator
Oil Pan.
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Bottom of the engine on the oil pan.
bottom side of the oil pan.............
straight above your oil drain plug
Right Rear of engine block. Above Alternator, Below coolant drain plug
A 2001 Mazda Protege has a seal system, meaning the car does not have a dipstick to check the transmission fluid. It is best to take it to a dealership to have the fluid tested, but a person can check it by slightly pulling out the plug under the car, and see the condition of the fluid coming out of the plug.
where can i find the transmission drain plug for the Mazda
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2000 Mazda Protege 1.6L MFI DOHC 4cylThe Spark Plug Gap.044 (In thousandths of an inch)
A spark plug for a 2003 Mazda Protege has a 14 mm thread size, and a 19 mm reach. The gap is 1.1 mm.