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Thanks. Yeah mine flashes a lot less frequently than that. The flashing light is detecting the MAF sensor info though, right? As opposed to the O2 sensor on the manifold?

Correct me if I'm wrong. I checked for errors by shorting out the bottom left two pins on the diagnostics socket and turning on the ignition. I got 5 long and 5 short flashes which indicates everything is normal, right? then on starting the engine and revving to about 2,000 rpm the light goes on...

Thanks guys, I've done that, in fact that was my first thing. I changed it and have checked it. Anything else before I change the Cat?

Hi My car (micra k11 1ltr) is refusing to pass the emissions test at mot. Originally I think this was down to bad soldering on the throttle body causing it to run super rich which I've attended to. However, I've since put cataclean through it and been for a blast on the motorway (waste of time...