Hi all

I have a 2008 tfsi vrs Octavia. I have had a few issues with random epc,TC and tyre pressure lights coming on,the car normally . Vcds throws lots of codes  mainly regarding voltage drop. It did It yesterday and while scratching my head looking at the engine I realised there is a whine, at this point the keys are in my pocket and the whine has been there for 3 minutes. It's coming from the black plastic housing of the throttle body. I can feel a vibration coming from the housing. I disconnected the battery and noise went away left it a few minutes reconnected and no noise. No lights on the dash.

I'm thinking that the throttle body is failing. Has anyone had a similar issue.

Thank for looking Pete

The white or high pitch sound is a characteristic. Mine certainly does it once the ignition is activated even if the car isn't started. You also heardr the throttle body flap open and close when turning ignition on.

 

You can output test the throttle body with  vcds. If it's not showing throttle related codes I would be inclined to think it's ok.

 

Have you replaced the battery, checked terminals, main wiring and earth straps for loose terminations or corrosion? 

Hi thanks for this. It threw up the following codes this morning. Pic attached just happened randomly slowing down for a red light.  Cleared the codes, completed a TB alignment all is good at the moment. Any help would be appreciated. Pete

Mmm. It could be the TB then. Or the pedal itself - it is drive by wire on an 07?  I wouldn't do anything until you get a recurrence. You could try using a TB cleaner if it is gunked up.  I haven't seen many cases of the TB going faulty on here but maybe it is just one of those problems dealers or garages are dealing with... There have been a few with throttle alignment or implausible signals that have resulted in replacement of the pedal electronics.

 

I would also check all the main electrical terminations.  Oct Mk2 are very fussy about voltages and low voltage, whether a weak battery or  poor condition wiring can cause a multitude of gremlins.

Edited 25 July, 20205 yr by TheClient

Nothing in here you probably aren't already doing but on the causes of alignment issue - there are a lot - low voltage is one. Also suggests dirty TB as I mentioned above....

 

 

Thank you, I will investigate the electrical connections. I've ordered a new gasket and will remove and clean the throttle. Also have a look at the pedal electronics. Pete