I recently scanned my S3 and found that the pre-cat oxygen sensor was faulty and I replaced it with a new one. Shortly after replacing it iv noticed my s3 would 'surge' or cut out randomly through out the revs while driving.
No fault codes either when I scan it.
Could it be something with the fuel? Fuel filter....fuel pump...injectors?
Thanks in advanced guys!
(Details of car: AMK, V3 CAI Badger5, N249 bypass, Forge splitter)