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I added some more to the end of the post with the workshop manual diagnostics.

Ok. There are I think three options (I have a 2004, wiring codes etc. might have changed): 1/ There is a permanent live into A4 on relay 38. Usually (ie OEM) relay 38 is commanded by the BCM sending a 12v signal to the relay's control coil. C3 is a permanent ground. The 12v signal enters...

If you take that relay out, do the fog lights go out?

12 year old tires are not a good idea IMHO. Suggest you fit new ones. Have a good 2019.

Some owners modify their X to bring the fog lamps on all the time. Possibly yours has been modified by a previous owner?

Modern, high quality gas shouldn't have sulfur in it (or only very low levels), it is a pollutant that should have been refined out.

Thanks. Does anyone have actual experience of dealing with OPG?

'Morning all I note that OPG are carrying XLR parts now (see Cadillac XLR Parts @ OPGI.com) A quick scan over their site suggests that currently they are only carrying GM parts available elsewhere, and judging by their prices, they are not yet the cheapest out there either. Anyways, does...

Yes, that's fair. I'm guessing I had taken the wheel off for other reasons.

IIRC you have to take the front wheel off first, it makes it much easier. It is very easy to swap out a headlight. Don't drop it.

The most common cause of 'warnings all over the dash' is battery failure. OK, so you have replaced the battery and that went flat too. There is a significant drain on the electrics somewhere I suggest. Do you have any aftermarket accessories fitted?

Mine is going the same way. It seems to be age as much as anything. I'll be fitting new shocks all round soon.

Make sure you get the trunk deck lid gas struts. Some after market catalogs are listing the hood strut codes for the trunk struts. The trunk struts are compact (MUCH shorter than the hood struts) and have very high loadings.

There are adjustments. You need either a workshop manual yourself, or a competent dealership with XLR skills (and the manual). Glad you like your XLR.

The gas struts (when working correctly) require an enormous force to compress them. You won't do it by hand.

You will need a full set of wiring diagrams in order to find all of them. Workshop manual.

Get a fuel rail pressure gauge and determine the pressure during the crank no start condition. There is a test point under the engine cover. Changing the fuel pump is expensive (in labor).

Many years ago I met a similar problem just once, it was caused by a a powerful transmitter near by jamming the car's electronics. It only happened parked in two specific parking bays, must have had focused power somehow. Any chance of that? There is a huge difference between a "no crank" and...

Mine do.

Check the grounds.