2001 Vauxhall Zafira engine management light

sounds like your cat could be shot, might need a new one.

Can you explain how you achieved this please;



"i did the holding down of the pedals and it gave me code 0420",

Fault code 0420 Catalyst System Efficiency Below Threshold. The catalyst system being referred to is your catalytic converter; so the catalytic converter is not working properly (i.e. it's not efficient).

The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor or wiring/ connectors.

I had that problem u can get second hand catalytic converter for manifold it cost me £200 that's catalytic and labour