406 v6 engine antipollution system diffective/inoperative

[v6saloon]

hi guys i was just driving my car and the engine management light came on with a warning on the screen saying engine antipollution system deffective, (it is a 2001 406 v6 saloon 210bhp) it also said antipollution system inoperative and the engine has lost power and is shaking like it is misfiring, does anyone know what this is, i believe it could be a coil pack but i wandered if anyone else has had this problem before i go out and replaced the coil packs, thanks guys, Dan.

[mjb]

Sorry, I think you may be one of the only ES9J4S owners on here Maybe one of the guys with another later petrol engine (HPi, 2.2SRi) can help?