Ford reckoned my spark plugs were modified ones but he never.said.what type. Would be good if it was them ones

how many miles do Denso last for ? or should be replaced.

as mentioned a spark plug socket makes things a lot easier. I have one with a rubber insert and one that has a flexi head and is magnetic. Although on the st the rubber one will do fine from what I remember.

i have started changing my oil and spark plugs ever 5k now

Apologies for the epic thread-dive, not sure what the rules are here, but I always prefer to not start a new thread when possible.

I have never changed the plugs on my Fiesta. They may have been changed as part of a service, but not by me. The car still purrs like a Kitten, but I figure they are well overdue.

So first noob problem, I can't figure out how to remove the airbox! I've opened it, which I don't know was necessary, but can't figure out how to remove it. Is it just brute force?

Then, what plugs should I be using? I'd planned to just read the existing plugs, but since I'm here, I should just ask.