Not sure what the 'auto' button is for but the other one is an immobiliser socket which you touch with a key adapter (usually hanging off the same keyring as the ignition key
The fact that it is changing readings shows it is working but could be clogged up and benefit from cleaning.
If you unplug it and drive with it and it shows an improvement then it will be the sensor that is faulty (as running on a default setting)
I won't imagine it would be easy due to the list of parts you would need and the level of work involved.
Finding a scrap car with a manual transmission would be easier
Hi....welcome to the Club
I would say this may have been a last minute substitution due to the semi-conductor shortages.
A lot of manufacturers have gone this way as a result of this issue and have released vehicles with lower level technology fitted
It would be advisable to change the fuses in case there is a slight fracture that cannot be easily seen
After that then you will need to check the circuits with a multimeter to determine where the fault is
Try checking the tyres (front and rear) for deformation
Usually chinese tyres are renowned for this
If you jack up the car on each corner in turn and rotate the wheel to see if it spins true and does not deflect at all
Some cars use an audible brake pad wear indicator that scrapes against the disc when it reaches a certain wear limit
When you hear that you will need to change them immediately
Hi Adam.....welcome to the Club
I would think that summer tyres are fine for the UK unless you live in remote areas with heavy rainfall.
All season tyres are okay to use but will wear out quicker and cost a lot more usually
Hi Trevor......welcome to the Club
You could take a feed from the ignition feed to the new stereo head unit.
Alternatively, Halfords sell aftermarket radio adapter leads to plug straight in and this would not affect any other parts such as the clock
Hi Luke.....welcome to the Club
I would say you are correct that it is the antenna and as far as I am aware it would not need coding to the vehicle as it does not generate or hold the immobilise code (the ECU would have that information) it simply amplifies the signal from the immobiliser chip in the key fob