UK-POLOS.NET - THE VW Polo Forum

Thanks for the help, I'll have a go at replacing the pre-cat sensor at the weekend first and see how that goes.

Hi

I have a 1.2 Petrol Polo and the engine management light came on a few days ago. It gave up code P0420 - Bank 1 - catalytic converter is operating low, chatting to a VW mechanic he suggested it's either the O2 sensor or the cat needs replacing. I figured as the sensor is less than £100 I'd try ...