Lambda Sensor perhaps?
Thinking about it, didn't Kimi have an exhaust fail on him in a Ferrari where the "tailpipe" bit was hanging on by the wire to the Lambda sensor for a few laps before eventually flying off? I'm sure that some of the hardcore experts on here will be able to put me straight if I am wrong?
FYI a wiki page about Lambda sensors:
http://en.wikipedia.org/wiki/Oxygen_sensor