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Discussion Starter · #1 ·
I have been hunting around to find the stock number for Motorcraft spark plugs on my 07 Focus. Here are the numbers I have found:

SP-448
SP-478
SP-541

Which of these would be the correct choice? (Or are all specced out the same)
 

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I do not know.

Many Duratec engine Focus owners use Autolite AR103 Copper plugs; available online and at your local car part store. Set gap to .050 to .055 inch.
 

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Discussion Starter · #3 ·
As I do further research, it is appearing the most important thing is making sure I have the right gap setting. (.051)
 

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I have been hunting around to find the stock number for Motorcraft spark plugs on my 07 Focus. Here are the numbers I have found:

SP-448
SP-478
SP-541

Which of these would be the correct choice? (Or are all specced out the same)


2007 Ford Focus SE 2.0 I was referred to by MFG customer service to use SP-541. I have them in the package still and have not replaced them yet.

I think the part number used to be SP-448 they updated the PN#.
 
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