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For 1.8L DOHC (mine is 2002, but 2003 should be the same) Open hood. Remove large plastic shield covering engine. Under the shield are two rectangular packs sitting side-by-side. The four spark plugs are under these two packs, deep in the engine - you will need an extension (and possibly a piece of hose) to get them out. Be careful not to strip the threads in the engine when installing new plugs.
According to the owners manual, they have platinum plugs that should be changed at 100,000 miles.
About every 50,000 miles.
Unless your ford focus is a diesel your car does not have glow plugs.
Heater plugs in a ford focus 1.8 engine should be changed every 18 months-2 years.
AS FAR AS I KNOW, THERE IS TWO SETS OF PLUGS FOR AN 02 FOCUS, ONE FOR THE SPI MOTOR, AND ONE FOR THE ZETEC MOTOR. THERE SHOULD BE ONLY ONE FOR EACH MOTOR. YOUR BEST BET IS TO CALL A FORD DEALERSHIP PARTS DEPT AND THEY WILL HELP YOU OUT. I RECOMMEND USING OE PARTS IF CHANGING PLUGS. ALSO, AN 02 FOCUS SHOULD HAVE PLATNUM TIP PLUGS AND DON'T NEED TO BE CHANGE UNTIL 60-80K MILES.
they will give you options when you buy them from the auto parts store
Spark plugs and wires should be replaced after 60,000 miles depending on the type of driving and the location where you live and drive.
you have to life up the rubber covering inside the wheel wells and the plugs are right there
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