oxygen sensor with sports cat and engine light?? info please

[c4c23]

I need any info/help please...

I have a 2003 Cooper S,

its got a sports cat (200cell) on it with a full stainless exhaust including the manifold... the engine managment light is on and wont stay off... ive had it at a few different garages and they always get the same fault code...

Code :- p0420. catalyst efficency below threshold bank 1.

so ive changed both oxygen sensors because all 3 garages said they are at fault, ( one being a mini specialist) and the light is still on?

is there anyway i can stop the light coming on? ive also being told i can get a upgraded oxygen sensor to control the gases but i cant find one anywhere! would the light stay off if i got it remapped? or could i some how write the ECU to bypass it??

also when the light is on is it true that you lose 20% of the power?

has anyone else had this problem..

Any info is appreachiated

Thanks Craig

[adsvx220]

Hi Craig I had this exact problem when I fitted a new exhaust system (not to my mini but vx220). The light never stayed off due to the 200cell cat I had fitted. I brought new sensors with no avail.

I ended up trying an O2 sensor spacer which I got from America. As soon as I fitted it I reset the light and it had never came back on after 5000 miles.

Here is a link.

http://o2-simulators.com/?gclid=CJTizeGG2LACFUxlfA...

Adam

[c4c23]

thanks for the info adam, how do they work? do you just put it in the place of oxygen sensor or does the sensor fitted to it? im guessing it a universal fitting?


Thanks again

Craig

[adsvx220]

The cheater screws into the sensor boss and then the sensor screws into the top of the cheater. Its basically a spacer to take the sensor out of the main flow of the gases. They are universal fit.

Adam