Technical Running rich

[fiatmultiair]

Hello,

I have an issue with my 1.4 Multiair running rich, my mechanic tried but failed, so I'm preparing a list of things I can change to potentially resolve the issue, does anyone have any tips suggestions on what can cause the engine to run rich?

The exhaust is black from all the soot build up.
I'm thinking o2 sensors, PCV valve, spark plugs?

 

[the green vanper]

Hello,

Have you checked for errors on MES / AlfaOBD?

If some sensors are failing, it shall point it.

 

[GrandePunto PL]

Show us the gas analyzer results (print)!
Not just "rich".

 

[fiatmultiair]

gonna visit the machanik to check the the diag, I don't own one currently.