renault megane 1.4 tce coupe
i have a 2011 renault megane coupe, its be great so far, but recently it has started vibrating a bit on idle and upon starting the revs go high for a second or two and drop down to normal, it also has a slight sulphur smell after about 20 mins of driving, so because of the sulphur smell, i took it in to have the cat checked out and the garage ran the computer through it and said the cat is fine, reset its 'brain' and gave me a print out. i am the kind of person who picks up on ever squeak and noise out of the norm and have an annoying need to learn what the issue is! there is no engine management light on.
the print out says it is miss-firering and the mechanic says this is probably because it may have a faulty oxygen sensor, they told me to run it for a few days and see if the brain reset makes any difference and if not, to bring it back to them. i am all for replacing the oxygen sensor, but would like to get some feedback from other mechanics, without visiting multiple garages and them seeing a woman and ££ signs on my forehead.
please and thankyou.