New Leon owner - engine cuts out!

Jul 8, 2025
2
0
Hi guys,

First ever Seat and love it but it I’ve got a problem already.
I purchased a Seat Leon FR Sport back in May. This is a 74 plate reg. Since having the car, I’ve noticed, now 6 or 7 times, that the engine cuts out while driving at low speeds when approaching, or pulling away from roundabouts and junctions. It isn’t a typical stall as the car already tends to be slowly moving. The dash eventually then tells me to ‘manually restart the engine’. To start with, thought it was me!

I’ve had it back at my local dealership. The car was looked over and the computer checked for errors. No fault codes were found. They also said the Seat technicians were unable to replicate the fault. I was told that they had seen similar issues before with the cars but no obvious fault was found. Has anyone heard of this?

Last week, the car stalled at low speed as I was going round a mini-roundabout. The car didn’t need to come to a complete stop at the junction. I lost all power and it took me two attempts to get the car restarted. This was dangerous and I was limping around the mini roundabout with traffic coming. I had to pull over as soon as I could to get the car restarted.

After the visit to the dealership, I am at a loss because they can’t carry out a repair as no fault is being shown but there clearly is a problem here.

I’ve been manually disabling the start/stop assist at the start of every journey to see if this helps. However, today, the start/stop was disabled and the engine cut out again after I had switched from second to first gear. I was promoted with the same message: ‘manually restart engine’. This was while approaching traffic lights which were red.

Has anyone heard of this?

Thanks in advance! 🙂
 

Syphon

Site Owner
Staff member
Feb 28, 2002
9,901
2,477
South West
www.seatcupra.net
Hi and Welcome to the community! That must be frustrating. Worth checking our Leon forum to see if anyone has had similar issues. Hope you get it sorted.

Cheers,

Scott
 

elrolzio

Active Member
Aug 22, 2016
1
0
I experienced a smilar issue tody, have the 2025 fr back edition 150psi petrol manual. Was changing lanes and went to accelarte and nothing appened. Felt like stop start but was moving to quickly, around 15 to 20 mph.
 

nd-photo.nl

Active Member
Mar 6, 2012
4,489
547
The Netherlands
youtube.com
This is going to sound weird, but check if the PCV valve/hoses are clogged. I had a similar issue with the VW Lupo from my girlfriend, which had intermittent power cuts due to clogging of this system.

Other things worth checking
- Health of the battery (does it hold its charge? and how much charge)
- Health of the alternator (does it charge with 14v)
- Random cuts and not being able to start also points to crank position sensor
- Does it happen with low fuel in the tank, or also with full tank?

Oil separator on the VW Lupo

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And what came out of it...

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