I have just fitted a mongoose downpipe and 200 cell sport cat to my focus st and after about 200 miles the engine management light came on ,I thought wit a sport cat it wouldn't do this ,any help would be much appreciated thanks Richard

 

what fault code are you getting?

 

Thanks for the reply mate ,fault code showing lambda sensor out of threshold ,I think sensor seeing too much flow lol ,going to scc for Revo remap ,so should be ok when remapped ,thanks again Richard

 

Got a 200 cell on mine and is fine, no codes coming up. Could the lambda be a bit dicky ? I guess you removed it from the old cat, that may have damaged it?

 

That's what code I had with a decat.

Custom map? That will sort it but suprised a 200 cell brought the light on.

 

Check its all sealed up ok because if there's a leak that will affect the lambda reading.

 

Thanks for replies ,had the Revo stage 2 map installed by scc performance ,guys did a diagnostic check and it said lambda sensor out of parameter ,mechanic said due to downpipe and sport cat lambda sensor just out of range ,when remapped everything ok ,asked if it would be ok at MOT time he said yes ,so I can only take his word for it ,car goes like a rocket now ,would definitely recommend the Revo software

 

Fair enough. Glad its all sorted and going well

 

hi funny i have a mongoos manafold and full stainless exhaust system and my engine managment light comes on when i turn ignition on but goes out after engine started, and car drives without any problem so can`t understnd what else the light would be on for dean