b11

hi there, i put a aftermarket air filter onto my s203 scooby but when i connected the air filter sensor and place it into the piping hole provided and start the car, the car start to die and drop to 0.5revs but once i take it off the car is fine and drives fine, but the only issue is engine management light is on, i think its to do with the sensor touching the metal piping
let me know guys
cheers