If you want to upgrade your original T3 Diesel engine to a better one with a minimum of work, the best way is to upgrade to a 1.9D / 1.9TD. But be careful, the 1.9D / 1.9TD had two differents phase. The first phase was extremely simple (just plug and play) while the second phase introduced an electronic management and an immobilizer. Which is not so easy anymore… Let’s go deep into it…