Hi I'm new on here and not very engine savvy

 

I have a 2019 skoda octavia taxi it's got 156364 miles on   had it from 19000 miles serviced every 10 k 

 

Last 2 months had a problem with emmisons engine light 

 

Was saying nox sensor so mechanic changed 

 

Light came on again 

 

I had it fully carbon cleaned a month ago and it was saying exhaust pressure switch so had that changed 

 

It's been on 5 times now in last month usually when I do a mway or bypass run 

 

It's saying exhaust pressure sensor again . Mechanic says he's no clue now and I'm losing the will 

 

Any ideas , thanks in advance 

AFter 156,364 miles I'd suspect the DPF could be clogged.