Hi, My Pre Cat (B1) lambda sensor is throwing the usual error code on my AUM 1.8T and guzzling fuel like no one's business!
My question is though, am I correct in thinking that the B1 is a 6 wire and the B2 is a 4 wire sensor.
Looking through eBay brings up 5 wire version's.. Plus I'd only buy the Bosch model.
Any advice would be great, thanks