Exhaust gas re-circulation insufficient mazda6

Egr valve is a major concern in these cars as mazda havent got this issue sorted. The light will come on and go off itself. No need to worry about it. I have had mine coming on and off more often that the blinking xmas decorations. Got the valve cleaned first few times but no luck. I had it blanked out on AAs advice as this valve does not do anything to the engine and is not necessarily required. My car even passed MOT with the EGR Valve blanked out. hope this helps

The exhaust passages are plugged with carbon, common problem, clean them out and retest