Hi all, i have recently had a full exhaust system and de-cat fitted . . . and the engine magement light is now on. i no this has something to do with the lambda sensor and i need some type of resistor to clear the light. ive had a look around and cant seem to find any can anyone point me in the right direction?? cheers!

 

does it have lambda sensors before and after the cat?

 

erm . . . . im not to sure to be honest, its a 03 focus 1.6 se if that helps?

 

the ecu will detect a fault if sensors before and after the cat have the same reading.

if the car only has one lambda sensor before the cat, the exhaust will not log a fault imo

 

There are pre and post cat lambdas on the 1.6 Zetec focus, you need an O2 Cheater or MIL Eliminator, last time i checked i think Pumaspeed sold them.