Hi..sorry for the delay
Hopefully i can help
What engine do you have exactly?
Whats is recent service and repair history/mileage etc?
Any engine issues that you've noticed since this warning flagged up?
Hi..there thanks for you reply..
Ok..the antipollution is just a generic fault warning that and coincide with the engine management means the car ecu has detected the fault - ideally the next stage you have to take on this is as any garage would do this first is to get it scanned for the relevent faults to be able to track exactly whats at fault here as this warning can cover a a huge area of possible faults aswell as codes..so as you'll understand the diagnostic route will have to the first step then see exactly what the codes are and take it from there - the most common in regards XXXXX XXXXX fault if i asume its petrol is usually an intake fault bad maf sensor / missfire fault bad sparkplugs or coils or a fault in with the catalyst "catalytic converter" either failed or oxygen lambda sensors on the exhaust can all have knock on effect in but those are usually the most common but without knowing the exact fault codes your cars logged it hard to say it just an easy fix with replacement sensor or not....however ensure that all fluids are upto proper levels inc oil/coolant etc - but as above the best step you need to take now is to get the car scanned and see what currently logged as per faults codes and that should help pin point exactly whats at fault and possible costs..I do hope this helps- if you need to ask anything else or inc lude any further info then just continue before you rate..