TH3PERFECTON3

I cold Started my car and was idling unusually longer due to a message on my phone then all the sudden the car star roughly shaking 3-4 times. Looked at dash and Engine light was ON. First time ever this happened to me and since I was at work I have no choice to drive. The car seam to drive normal until I hit the stop light where I experience another set of shaking. And noticed a 800 RPM dip from 900 The engine still wasn't warmed up. After it warmed up the shaking went away and on a free way the car was driving as usual although I was not pushing it beyond 3K rpm just to be on a safe side. After Parking and re starting the car I did not experience a shake right away but engine light remain ON.

The Car is 2013 A6 2.0T @ 60K miles
recent oil change and air filter.
The spark plug where replaced @ 50K

I do not have any OBD Tool To scan for codes And I do not know how soon the Dealer can make an appointment . I have a couple in Chicago area. Its Sunday and I'm thinking about it I know it may be a # of things but maybe any of you could shed some light before I see the dealer. Car is under CPO warranty.

DB22

Many scan tools will cost less than a trip to the dealer. I recommend Ross tech, for numerous reasons, as a great investment.

BTW I have no idea where the spark plugs were replaced.

TH3PERFECTON3

Definitely need to invest in a scanning tool. Puled up to my local Auto Zone and they scan it for free printing out the bad codes there was 7 of them and they all reflected to bad O2 sensor . Could that cause Rough Idle ?

DB22

Yes it could but not conclusive. There maybe other issues but start with changing the sensor.

1guitar

I had a similar experience with an older MB C class car, this was about 10 years ago and it turned out to be the O2 sensor. At the time there was no time expectation how long the O2 sensors would last, today I believe they usually last about 100,000 miles, at least that is the schedule as when to change them, so, you may need a new one. A word of caution, before you do anything put an OBD2 scanner on your car and that should spit out the correct trouble code. If you work on your own vehicle than you should buy one, you can get a good one for about $90-$100 and it will pay for itself quickly. Good luck.

NABS4

Or he should start by using his CPO warranty.

537playing

You most likely have a bad coil. It costs $20. Go to an Autozone and they may pull up the code showing with cool is bad.

TH3PERFECTON3

Yes That's the plan. Have an appointment for Wednesday will report back what SA found.

OLI77

Interested to see if there was a conclusion to this episode. My car is at 60K miles and I may be feeling a smidgen as the OP does with a rough idle on cold start for ~1 min.

ImadAl

Tune Up, Engine light MAP sensor