Hi PhilThese later hybrid ECU's both Simtec and Multec are complete garbage. The failure rate is very high and P0505 is common on MS70 ECU's /X18XE1.
But what gets me is these ECU's are still very expensive units to buy £450 even though the failure rate is so high.
Programming needed if a new unit is fitted , second hand units must be reset before removal or you will need engine ECU ,Immobilizer ECU and the Transponder key from donor car. Also get Reg no: and chassis No: to get security code for future coding.
I don't no of anybody Who repairs these units yet????????
It's got to be down to cost cutting and cheap components and ECU locations. The old Simtec 56.5 were bomb proof in the Vectra B with very very few failures I found.