Hi someone please help I brought a st 170 03 plate a week ago, last Thursday it wouldn't start in the morning so I plugged into an obd reader came up with 3 faults heater sensor and inlet manifold something so chenged the fuse in the heater sensor but cannot for love nor money locate a relay that Intails the inlet manifold please help just want to replace it Asaph as it has a misfire and is pinking???????????