You know when you mentioned that you checked the connections to the ECU in your OP?
Did you double check to see if any of the pins were bent?.....They can bend very easily on removal, If so very carefully straighten them out and spray with electrical contact cleaner and gently refit.
Hi! Sorry for being away, I was trying to fix these errors...
I have checked pins together with a dealer. All is fine there.
BTW, I have visited several dealers in my country, noone have any idea what the problem is.
Do you have a spare key fob? If so..... Try that for the time being, it could be the little transponder block in your original key playing up.
I do have spare key, but we have discovered that ECU is replaced, and immo chip is tied to immo antenna :-( so spare key will not help since key code is allways on.
BTW, can I replace immobilizer box? blue box?
I am waiting for a car electrician specialist to take a look at my car next week.
With MCSF warnings first thing I would do is go and get a free
battery and alternator check to check the state of charge.
Many tyre and exhaust centres offer this service and only takes 5 minutes...
Take no real notice of what they say about replacing this and that if they give you the sales patter, just ask for a read out results and post them on here.
Even if the car starts ok, it could be low on cranking amps and /or not charging correctly at a voltage that the ECU is happy with.
That eliminates one common cause for MCSF....
The rest could be more difficult to find without a ODBII code reading when the fault actually occurs
battery and alternator are fine...
one funny thing is, when I connect examiner, read errors, once will show U1601. I can clear it, but it will re-appear together with U1706. If I clear these again, only U1601 reappears. Again, when I clear U1601, together with U1601 appears U1706
I will try to find replacement blue box and try that, while waiting for that guy next week.
If you can give me any other suggestion, please do. And thanks again!