Limp mode. Boost issue or DPF?

Jun 7, 2025
3
4
My Leon ST (2.0tdi) 2018 sometimes loses power on boost, and goes into limp mode. I've done a 200 mile round trip today taking it easy as it's raining heavily, but booted it down the on slip of the M18 and ping... Coil light + error message which said 'stop start error' and limp mode. Light are below.

I don't have a code reader, and I'm hoping it isn't too expensive to fix as I've just spent a fair amount on the suspension.

Can anyone point me in the right direction? Any common issues.

Car is driven daily, my work commute is 60 miles.

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