My car is a 2016 c4 grand picasso exclusive automatic. I have had slight issues with this car since I got it 3 years ago. Firstly the eco engine cut off did not kick in, it's only worked about a dozen times since I got it. Also the blind spot indicator didn't switch on. When activated the red light would blink on the mirror then the computer put a '!' next to it and deactivate it. They where the initial errors.... everything else totally perfect. About January last year it gained a slow puncture very minor only had to reinflate once every 2 months when the sensor noticed it. At the same time I noticed that the door unlock wasn't extending the wing mirrors out every time. Then after a while the electronic boot would not work from cold.it would unlock but not open. As the months passed and asking the local garage to have a failed look at it, errors started to pop up after the tyre pressure sensor had popped that error up. Engine management error 'have the vehicle repaired'. Service light would illuminate. Then urea error. Sometimes I would get a very quick flash of low battery. During this time the car would take longer to start. Where it would start straight away in now takes sometimes 5 mins before the ignition would kick ii noticed the error messages would disappear once I inflated the tyre and reinitialised the pressure gauge, but the background problems remained. I had the tyre replaced in September but now the lights are stuck on and the urea will start a cut off countdown of 700 miles for it to get down to 200 for it to start blinking again then restart the count down. So during its MOT last Monday I got them to check it with the scanner thingy and the ABOVE errors are the results. They wiped them but only a few came back they never told me which few.when I picked it up from the garage I have a new error of passenger side airbag/seat belt error. I think it is probably only a few faults which are throwing off the entire system. I'm thinking of starting with the fuse boxes although I did check them last year and it looked all ok no corrosion or signs of water egress and fuses where all fine. Then I'll check the tyre sensor also the blind spot indicator wires. Please can anyone help or point me in the right direction as I'm tearing the last off my hair out.

Thank you in advance for any help or suggestions.