Hi Tom,

Thanks for correcting my acronym directory here.

Here's an old link to Penetrox
https://www.ebay.com/itm/385735185784 $16.04 Apr 2024

You didn't put the model year of your car, and I wonder if you're being victimized by an overheated PEM? I went through this with a friend, also with a similar
issue with a new 850 fuel relay (solid state) overheating.
The hotter they get, the flakier before outright failure, followed by working again after cooling down. Volvo had some PEM's in the trunk and some under the
car. The idea is to cool it but not have it get full of water and salt from the road. So you'll want Penetrox for it's connector and thermal paste for the heat sink. If it's outside maybe use some silicone sealant to improve the weatherproofing of the box?

look here:
https://www.swedespeed.com/threads/pem-failures-solved-theory-and-solution-inside.657803/

HM, Bill

Happy motoring :-)