2020 Leon 150ps - Intermittent electrical issue on start up

[OllyKBY23]

Good day,

My warranty is nearly out but would like to know if anyone else has had an issue with their Leon having a very rare and random hissy fit when starting the engine.

The engine starts up initially and sounds rough like a certain sequence isnt being carried out properly and continues to run rough. At the same time the cluster is lit up like a xmas tree with multiple systems inoperative.

I then cycle the ignition and it is totally fine and can go on for a week or up to a month without faulting again.

I find it hard to believe to be a wiring issue because you would think it would happen while driving but only on startup. Some sort of PCM issue?

Please advise.

 

[SamuelDonuts]

Perhaps check battery voltage? It might be stable with no load but may be dipping way below under load (starting), I know that can cause control modules to freak out a little on previous gen VAG stuff.

 

[Alex667]

Sounds like a battery on its way out. My last car (Insignia) used to do the same thing in really cold weather before the battery gave up the ghost and I replaced it.

 

[BillyCool]

Are you getting any fault codes?

A battery is about £130, so worth a go to eliminate that?

 

[SuperV8]

Would be unlucky for a battery to fail so soon on a 2020 car though!
Don't Halfords do a free battery check?

 

[SRGTD]

Would be unlucky for a battery to fail so soon on a 2020 car though!
Don't Halfords do a free battery check?

There’s been a few battery failures on VW Golfs within the 3 year factory warranty period and replaced free of charge by VW.

Yes, I think Halfords do a free battery check so worth the OP getting it checked and if it has failed, then like VW, presumably Seat would also replace it under warranty.

 

[Carl Levoir]

I had my battery fail after 2 years and was replaced under warranty on a 2017 Leon. The mobile VAG guy to came to the house said the VW had bought a duff batch of batteries.

 

[OllyKBY23]

Sorry for late reply. Sent into dealer and found fault with camshaft position sensor. I think they replace both intake and exhaust sensors and have driven 10k miles since without any issues.

 

[Walone]

Sorry for late reply. Sent into dealer and found fault with camshaft position sensor. I think they replace both intake and exhaust sensors and have driven 10k miles since without any issues.

It's always nice to get an update on a good result.