Okay I’ve sorted it myself. Unbelievably it was a Bluetooth unit plugged into the cigarette lighter beside the ashtray, remember them. Spent hours running through what had been replaced that may affect the TPMS display and other associated features and finally came down to what I thought was madder than a bucket of frogs! A new BT unit for the phone. Removed it and instantly all the dash fault lights went out and as long as I don’t have it plugged in all is fine. Oh well, back to the earbuds I suppose.