The Saint wrote:Yes I took a reading of the sensor... 325 Ohm.. so way off scale!!
Yes .... way off ..... the carbon granules are preloaded under pressure to get the correct passive resistance in manufacture, I suspect the diaphragm has let go and the pressure on the granules has gone hence the high resistance.
As for the switch, I carefully poked a small allen key up into it, and pressed the diapham. It started to click and for a while it worked. but then stopped... I gave it a few taps on the desk and it worked again.. but I dare not use it like that.. never know when it will stop working again, so getting a new one!
Well for 4.58 euros for a new one its not worth messing around for.
However .... don't even think of getting one from Simon Autos as his price for the same pressure switch is ...... wait for it ...... 249 euros.

............. can't help feeling its a mistake, but I am not going to ask.
BTW I almost forgot to say.. that I eventually got the sum plug out!!
I WD40'd and left it a few days, then used the 8mm square key thing and spanner with a trolley jack to very slowly put enough pressure on the spanner to crack off and loosen the bolt...
Unfortunately with those 8mm square key things, depending on the radial angle that the plug tightness up on, it is impossible to get a reasonable leverage as it can only fit in two positions from the underneath, that's why I suggested a 3/8 ratchet if it can be got to engage, as you can then adjust the position of its handle to be pointing downwards ..... if the angle of the key is around 45 degrees either side of vertical, it is almost impossible to get the leverage with the car on the ground. I usually lay across the car where you can get a better pull than putting your hand in from the back of the car so to speak, but yes, they will always let go with a crack.
Anyway glad to hear you got it off in the end.

1990 GTA Atmo, 2003 Jaguar X type 2.5SE Auto, 2018 Kia Picanto GT-Line-S 1.25