ST170 management light keeps coming on

[Mr_C]

Hello people,

my dad's got a 2002 ST170 and despite having 3 or 4 lambda sensors, 2 cats and more diagnostic checks and resets than you'd believe, the engine management light keeps coming back on. He takes it in, they can't get a fault code off it, turn the light off and it's ok for a few day then, for no aparant reason, the light will come on again. My mum reckons it came on last time when she went over a bump, which might indicate a loose connection, although it could have been coincidence or she just imagined it...

Has anybody got any ideas of what it could be, and how to fix it?

thanks

Paul

[stevenr]

i have a 2002 170 that also suffered this problem.gave up on it in the end and just ignored it.been on since about a year and a half now with no apparent problems but it does get a bit annoying at night sometimes

[chris_w666]

If its an early 2002 st170 then there were some issues with the ECU software, this was sorted late 03 and certainly for the 04/54 onwards cars but this upgrade should be available for the early models through ford dealers and I believe when the new sofware was first available that it was free. Not sure if this will help. Best to try an st forum or http://www.fordst170.co.uk/ as this has all know issues and fixes listed.