i drive an astra g 2.2 sri, a couple weeks ago i noticed the exhaust emissions light pop on (at the time i didnt know what it was), and also the engine felt like it was struggling. this was at high speed on the motorway, slowed down for a bit, and it went away pretty quickly and off i went and forgot about it.
today i was doing around 40mph and the same thing happened again, the car accelerates, but very slowly and feels like the engines really struggling. this happened for a few mins until i could pull over, left it for 2 mins and it was fine again, and the light goes away.
any ideas on whats wrong?