You cant do anything to diagnose this - without plugging in a scanner .
Forscan - that's what they recommend here .
NOTE: you can use forscan to get correct fault codes with proper explanation of them - a generic fault code reader may be somewhat misleading
"Forscan" is FREE software that you download to a laptop..you buy the interface cable -- this is just the cable you need a laptop)
You can join the forscan forum ..again free, to get the software and more answers.
https://forscan.org/forum/all the best.mark