I thought it may be an idea to have a spare set of plugs but it doesn't seem quite as simple as I thought. I have a 2005 +4 with a 2 litre Duratec engine. The handbook says the plug number is Motorcraft AGSF22PGM. I have tried to cross reference this number via Google with an NGK part number. The nearest I can get is NGK PTR6F-13, the site I found said that this may be the replacement.
I would be grateful for confirmation or not on that suggestion.
