Thanks Geoff. I'll let you know how I get on.

Hi,

Could anyone confirm my understanding that a 2000 v6 normally has a 2 wire unheated O2 sensor? On the last MoT the van failed with a bad sensor so I replaced it with a generic 4 wire and didn't connect the heater circuit. It was still hard work passing it and in the testers words 'it suddenly ...