Hi, I’m having a few issues with my Audi A5.

Firstly, anytime I start the car on a cold engine the car shakes for a few minutes 2-3 mins due to excess air build up. This is the error codes I get:

P2187 - lean fuel mixture at an idle in either Bank 1 

P2279 - intake air system leak

I tried using fuel injector cleaners and the engine light still keeps coming back with these two codes. Anytime I reset the codes and start the engine the engine excessively shakes for around 3 minutes until I rev the air out. 

I think that the P2279 code is due to some air leak and I am planning to run a smoke test through the engine to detect the leak, if no leak founds I saw somewhere that I should replace the sensor. 

I’ve also saw a video replacing the PCV valve diaphragm could fix the issue. My valve seems fine however I read somewhere that they may look ok but still be at fault. Therefore, I have ordered one and waiting for delivery (see attached photo).

Apart from these two codes popping up and the engine light going off as well as the shakes when starting a cold engine the car runs perfect. 

Anyone had any similar issues or know what the problem could be here?

Edited December 20, 20223 yr by Tyx98

Sounds like you're on the right tracks. Please keep us posted on how you get on.