My theory is that there is mouse damage. Occasional shorts caused by insulation gnawed off wires. That will give this kind of intermittent error. Every time you mess with the car you may jiggle the wires enough to clear the short, but when driving the cables jiggle back to the short.
Good luck/Anker
__________________
2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
|