Would EML light come on if the front assist is not working?

Yes, in some cases, the Electronic Management Light (EML) or Check Engine Light (CEL) on a 2017 SEAT Leon could come on if there is an issue with the Front Assist system.

This guide can help to get the codes:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please go over this guide and get back to us.

Have put car on machine and nothing shows up but the front assist triangle warning light is on as well as eml.

Did they do a code scan?

Yes was all clear.

Did they do a CAN scan? This kind of scan goes over the entire car not just the drivetrain. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:


https://youtu.be/u-4syLc-ifQ


Please go over this guide and get back to us.