My daughter has this
problem after for the EGR light having a non gen lambda sensor & cat fitted. For the EPC light I've changed both brake light switches to no avail. This is going to cost her big time unless anyone on here knows where she can go from here. The Lambda sounds a simple fix but there are two on the car & we're not sure which one was fitted when she had it done.
Please
help.
First buy a simple but reliable scan tool, like the VAG one from
www.gendan.co.uk - it costs about £40. EGR issues, in my recent experience, are caused by the tar/gunge build up in the inlet manifold below the Throttle Body, where the crankcase fumes make contact with the recirculated exhaust gasses from the EGR.
The scan tool is essential to find out what is happening cheaply and quickly.
There does seem to be a bit of history of these 1.2 engines needing their manicats replacing, though I don't know off the top of my head, what the root cause is, oh and don't expect great results from aftermarket Lambda sensors, stick with VAG sourced ones.
I'd expect EPC problems to be related to the Throttle Body assembly or something near it - if the brake lights are working.