I have a 1999 156 1.8TS, the code box(immobiliser) light is on and the engine does not start after a jump start failure, though it had started OK previously, the normal key was in the ignition barrel on both occasions. I am currently starting the engine using the pedal PIN over ride(Can this be done on a regular basis, I hate to stall it at a junction?)
I have checked all fuses, sanded and reseated relays in front of the battery, change the battery, supply to code box @12.6V(red and black leads) checked the antenna around the steering column for continuity and resistance, both seemed OK. But the light is still on!
Took the car to an Alfa 'specialist' in south London who said the code box was faulty and recommended a new one, was about to bite the bullet until I saw its mechanic looking at the pin card and had no idea how to enter it, also noticed the battery was disconnected for an hour, so they obviously tried to reset box and start the engine when the code box light was on, + there was no print out from the diagnostic scan, which they asked for payment upfront! It didn't give me much confidence of their competence, so I took the car home!
My questions are, can the code box, or the pairing of the keys, be damaged/corrupted during the jump start process? Even the 2nd key does not work, which was at home at the time, though both can remote lock and unlock the car and start the car(using the pedal sequence). What is the best way forward, and the process involved in replace the code box(immobiliser), which I have in front of me? PLEASE HELP!
Your expert advice would be much appreciated, especially Minirib!