Hi that would do it, the remap has possibly done the damage as the pistons on these EA111 engines have a weak point insomuch as increased boost pressure and fuelling cause the ring grooves to fail and bits fall off of the castings where the rings locate which is probably why you have compression failure, having spoken to my garage they reckon timing chain tensioners can fail anywhere between 40k-60k which probably explains why in a short time they phased this engine out and bought in an upgraded belt driven engine. Steve.

Hi I think you need an auto electrician to sort this one out but I have a sneaking suspicion the comfort control modules have possibly been fried as they don't like water or being shorted to earth, my advice is tell the mechanic he has to pay for the fix. Steve.

Stage 1 about 3 years ago. Most other improvements are wheels, Interior leather, S/wheel & brakes.

Hi you can't just swap the airbag module as the steering wheel originally fitted is completely different, an auto electrician could probably sort the wiring but the new wheel would need coding in and thats if you don't need another control module. Steve.

Hi if its failed a sniff test its academic the gasket is leaking, I personally would do the same as the first garage if you take in to account that the head will most likely need a skim to correct any surface defects, then the valve seats would need to be lapped in, the timing chain is worth doing as even at 60k its probably stretched and the guides will be worn, factor in possible bore wear and you have the potential for a catastrophic wallet failure, from memory these engines were not good from new and if driven hard don't generally take to much action, you also mentioned improvements, one of them was not mapping was it? Steve.