Ive got a 1995 P38 4.6 which has generally been pretty reliable, I had an EAS fault about a year ago but downloaded one of the EAS unlock programmes and it was fine up until about 2 weeks ago ..........

Basically, I noticed one day that all 4 lights were illuminated on the height select switch and the "high running" light on the dash was also on, but theres no EAS error message and the car seems to be working fine, although the damping is maybe a bit harsher than usual.

The weird bit is that when I plug a laptop in and run the EAS software everything starts working again, I can select heights, only one light is lit on the switch and the damping is back to normal. Leave for a couple of days and it reverts back to all lights being lit and no height selection available again though.

The EAS software shows no faults, the car isnt showing any error message and its not really a massive problem but something aint right - the airbags were replaced 30K ago and are all in good condition, and if it works with the laptop plugged in I cant see theres anything major wrong, any ideas anyone?

Look at the two white plugs behind the trim panel at base of N/S A post in passenger foot well. Check for damp and corrosion. One of them is the interface from the height selector switch to the ECU. Any interaction between circuits caused by damp or corrosion build up will cause that problem.

As above, also part and remake the connectors in the EAS box and check the earth points on the wing between the EAS box and the air filter box.

Finally got some time to have a look at this and fair play to Wammers, while my initial attempts at getting the corrosion off (emery paper) were unsuccessful, blasting the daylights out of them with WD40 then using a small paintbrush seems to have done the trick :cheer2:

Only got to sort the misfire under load now and then I can wait for the next part to fail

docwra said:

Finally got some time to have a look at this and fair play to Wammers, while my initial attempts at getting the corrosion off (emery paper) were unsuccessful, blasting the daylights out of them with WD40 then using a small paintbrush seems to have done the trick :cheer2:

Only got to sort the misfire under load now and then I can wait for the next part to fail

Click to expand...

WD40 is not a good contact cleaner, it goes gummy as it dries.