I started a topic the other day about my 51 1.6 Focus juddering - this problem seems a lot better, if not gone all together now that I've changed the sparkplugs and HT leads/plugs.
I've been reading some other topics/posts and think the problem(s) may be linked or not what I first thought.
Firstly cilender 1 had a compression test done to it and the garage said it was low - making them think it's probably a piston.
When I changed the sparkplugs, 1 and 2 had a bit of oil in them - this has now gone with only VERY small amount in there (barely any).
So I'm guessing this has probably resolved the issue of the juddering - hence piston okay?
But the engine light is still on - also the speedo sometimes randomly drops to 0 - could be for a split second or for a mile or so.
Ford want £54 to plug in the machine and let me know the code - surely there's another cheaper way and/or finding out myself? :/
So, basically the thing is - is the light on for a 'faulty' piston or something else?