Buyer's guide Common Issues on the MK3 Leon

Work in Progress

SEAT LEON MK3 – COMMON ISSUES

Below are the issues I have seen on both the Web and this forum that pop up time and time again.

1/ Front LED Lights turning foggy

Does not cause MOT Failure but looks like there is something on the inside of the light fitting check out https://www.seatcupra.net/forums/threads/headlights-haze-on-glass.456234/#post-4879806 there is also a link to a much longer thread on the subject.

2/ Rear Indicator Issue – Water Ingress

• When the cars were new this was a common problem as the rear lights had been over tightened causing the lights to crack
• Now the cars are getting older the rear light seals may need replacing or it could be caused by pressure washer forcing water in see https://www.seatcupra.net/forums/threads/2019-leon-rear-indicator-issue-water-ingress.482184/

3/ Heater Matrix needs replacing

• Some people see this first because the heater stops producing hot air across the board or on one side
• Others have issues where they are leaking coolant, on the Diesels this is often seen after the DPF Regen occurs

How to replace can be found on multiple post on the forum but one example https://www.seatcupra.net/forums/th...ething-problems-but-sorted-in-the-end.476713/

4/ After Replacing Battery the dashboard lights up like a xmas tree

• Take the car for a drive and the errors will self clear
• Turn steering wheel all the way to the left and then all the way to the right can also clear all the errors

5/ Water in the wheel well

• Water can get in from sunroof drain plugs
• Water can get in from worn rear indicator seals
• Water can get in from rear air vent (one each side)
• Water can get in from the rubber covering for the electric cables into the rear door
• Water can get in from rear washer connections
• Water can get in from front doors (yes front doors) check out https://www.seatcupra.net/forums/threads/pool-of-water-in-spare-wheel-well.435394/#post-4699386 for more info and Youtube link

Please feel free to add in the comments and I will update the Resource so we have a complete list all in one placve.