Recently got a 1.9TDi Fabia Mk2 to add to the Skoda fleet (other is Mk1 1.9TDi!). Happyish with the car, but encountered a strange one this morning. When I started up, the car revved up to 1600rpm (no foot on the accelerator, no car mats stuck etc) and stayed that way for a few seconds until I dabbed the accelerator and then dropped to an idling speed of about 900 (which I take to be normal). Have also noticed that when stopping at lights, gear in neutral and handbrake on, the car occassionally idles at 1200rpm for about 15-20 seconds, and then drops to 900. The MK1 always maintains approx 900rpm at idle, and drops to this figure as soon as the car is at stand still (then, it is lovingly serviced by Unit18! ). No DPF in the Mk2 (checked the codes in the service booklet) so can't understand this odd behaviour. Any ideas what could be up with the MK2, before I take it to the dealer for a check up (under warranty)?

Edited 28 November, 201015 yr by GnatG

Recently got a 1.9TDi Fabia Mk2 to add to the Skoda fleet (other is Mk1 1.9TDi!). Happyish with the car, but encountered a strange one this morning. When I started up, the car revved up to 1600rpm (no foot on the accelerator, no car mats stuck etc) and stayed that way for a few seconds until I dabbed the accelerator and then dropped to an idling speed of about 900 (which I take to be normal). Have also noticed that when stopping at lights, gear in neutral and handbrake on, the car occassionally idles at 1200rpm for about 15-20 seconds, and then drops to 900. The MK1 always maintains approx 900rpm at idle, and drops to this figure as soon as the car is at stand still (then, it is lovingly serviced by Unit18! ). No DPF in the Mk2 (checked the codes in the service booklet) so can't understand this odd behaviour. Any ideas what could be up with the MK2, before I take it to the dealer for a check up (under warranty)?

Hi, had similar trouble in a 2007 mk1, it was the throttle position sensor, sorted under warranty. I believe the late mk1 shares the same sensor as the mk2. Had allsorts of random idle speeds, even 3500rpm once! Sometimes putting your toe behind the throttle pedal and lifting sorted it temporarily. Hope this helps.

Hi, had similar trouble in a 2007 mk1, it was the throttle position sensor, sorted under warranty. I believe the late mk1 shares the same sensor as the mk2. Had allsorts of random idle speeds, even 3500rpm once! Sometimes putting your toe behind the throttle pedal and lifting sorted it temporarily. Hope this helps.

Cheers mate! That sounds like the problem I'm having - I did lift the throttle pedal one time and that dropped the revs back to normal levels. Will ring the dealer tomorrow to get it booked in. Funny thing is, this happened after I collected the car (after it had been vehicle checked and serviced) and I was on my way home, not during 2 extended pre-purchase test drives. :wonder:

Cheers mate! That sounds like the problem I'm having - I did lift the throttle pedal one time and that dropped the revs back to normal levels. Will ring the dealer tomorrow to get it booked in. Funny thing is, this happened after I collected the car (after it had been vehicle checked and serviced) and I was on my way home, not during 2 extended pre-purchase test drives. :wonder:

I remember another Briskoda member telling me at the time that this problem does not show on a diagnostic check, the checking computer assumes someone has their foot on the throttle slightly! You either need it to be happening when you take the car in, or, better still, a mechanic or service manager who has experience of this fault. My service manager knew exactly what the fault was from my description and didnt even need to look at the car. He just ordered the part up and booked me in for it changing. It only took about an hour.

I remember another Briskoda member telling me at the time that this problem does not show on a diagnostic check, the checking computer assumes someone has their foot on the throttle slightly! You either need it to be happening when you take the car in, or, better still, a mechanic or service manager who has experience of this fault. My service manager knew exactly what the fault was from my description and didnt even need to look at the car. He just ordered the part up and booked me in for it changing. It only took about an hour.

It's amazing how much a diagnostic check may not tell you. Had the same problem recently when the fuel relay went on my Polo - it was a case of changing things until the problem was sorted! I'll be ringing the dealer later on with an "expert" Brisky diagnosis! Cheers for your help.

Before you take it back to your dealer, if I remember correctly you can reset the throttle position sensor your self. If that does the trick then that's great. Sometimes if the battery has been remove or disconnected the throttle position sensor can go out of kilt and needs resetting. This often happens to second hand cars these days as the battery is often disconnected and charged and/or replaced whilst it's waiting to be sold. I'm afraid I cannot remember how to reset the sensor but I'm sure I have seen a thread on here about how to do it. Good luck.