08-02-2021, 12:53 PM
Even if you did get the 2.0 16v to start using the 1.8 ECU I expect it would run pretty badly. I doubt you'd be able to remap the 1.8v ECU either. Get yourself a Bosch MP5.2 ECU designed for the 2.0 26v engine. There were different maps depending on the injectors fitted (see https://www.306oc.co.uk/forum/showthread.php?tid=36149). I can dig out the Bosch codes for the ECUs fitted to the 306's but don't know what the codes were for other models (406, 605 etc). You'd need an unlocked ECU (preferably hard unlocked).