RPM drops when idle

[antonws3]

Revs have been dropping ever so slightly when idle and can feel it when driving. Engine management light has been on but gone back off. Taken my s3 in and they had it scanned and said there is air in the system. Would this be an easy fix for myself?

 

[S3Alex]

It's often the PCV that causes idling problems,so it would be worth looking at that first.
If there is an air leak,it may be the cause.

It's not a job I've done,but no doubt someone else will be along with advice shortly.

 

[kash_v]

More then likely pcv valve, easy job to swap it over.

 

[HHS3]

I had an idling issue in my S3 and like many others, the PCV was at fault. It's cheap & easy to replace, 06F 129 101 R is the part number for the updated version.

 

[antonws3]

It was the pvc that needed changing to sort the uneasy revving issue also I cannot believe the difference in power I lost, feels like the cars been mapped or something after the new pvc has been fitted!