I have a 2004 st170, the eml comes on ever so often with the code p1518, I'm led to believe this is the imrc stuck open? I've changed the imrc, the inlet manifold and the inlet manifold sensor( well the sensor on the inlet). I have a cheap eBay code reader that I've borrowed from a friend and also it's been code read from a mechanics and they can't find any obvious faults because it's so intermittent. My issue is that some days I have lots of acceleration power then other days it bogs down and makes lots of noise but doesn't move fast? Ive just had the car MOTed and I was told that I may have the wrong lambda as they are colour coded?? I got the lambda sensors from Euro car parts and I've been told electrical stuff from there isn't that good and has problems ( a few garages have told me this) so I'm unsure of what to do? I don't want to spend lots of money on a new imrc, or new lambdas again. If anyone can help I'd be most greatful! I know these cars aren't the fastest but when they work properly they do move!