Driving the Megane this morning and the check emissions light illuminated, not flashnig though.
I always carry a couple of spare coils
so pulled over and spent half hour swapping them around but the light was still on and the engine continued to run normally
On returning home i hooked the vehicle up to CLIP. Straight away flashing amber ''DF106 Catalytic converter functional fault'' was displayed.
With the engine at optimum operating temperature the upstream oxygen sensor was fluctuating between 70-750 mv, heating resistance 26 ohms.
The downstream was static at 410 mv, heating resistance 0 ohms.
Is the fault with the cat' itself or the downstream sensor?
I've cleared the fault, the lights gone out and not come back on after 15 minutes idling.