hi there anyone with a de-cat pipe on there car could you help, ive made a decat pipe in work and am just wondering do i need to run the second lambda sensor ( one after cat) i currently have it unplugged and the cars running fine but should i still fit the other sensor in?
any advice would be great, cheers

i don't run mine with the sensor in and its been fine for months...

even did a track session without it!

You only need the first one mate, as Dan said.

I've just had mine replaced as none of them were working
Bloody expensive little thing...

What do insurance say when you say that you have a decat?