Please Help Warning Light & chime not going out

zee1

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Hope I'm posting in the right section not sure if I've got an 8p or what
It's an A3 2011 2.0 TDi

I had a flat tyre yesterday so put the space saver on and drove to get a new tyre
Along the way the pressure warning light came on then it turned red and was flashing.
After I got my new tyres on (had to change the other one too) I tried resetting it as per instructions in book but it's not resetting. I took it on a long spin as my DPF needed unblocking and thought the speed might sort it or hug it still won't reset
What should I do or will it be more cost of taking it to be put in the computer