Bmw 523i MSport

Genuine MSport. New engine was fitted last year and a considerable amount of money spent to try to get it back fully operational. Unfortunately problem remains, owner has no interest spending any more money. Suspect that thermostat fault code is listed and all the symptoms. Also showing catalytic converter fault which can be related to the thermostat fault. Car will drive but does go into limp mode I would recommend bringing it on a trailer. Serious calls only please no interest in breaking or someone trying to diagnosis over the phone or on my street.