Lancia Lybra Owner's Handbook Manual page 7

DEVICES FOR REDUCING PETROL ENGINE EMISSIONS
Three-way catalytic converter (catalytic exhaust pipe)
Carbon monoxide, nitrogen oxides and unburned hydrocarbons are the main harmful components
in exhaust gasses.
The catalytic converter is a "miniature laboratory" where a very high percentage of these compo-
nents are converted into harmless substances.
This conversion is aided by minute particles of precious metals on the ceramic core enclosed in a
stainless steel container.
Lambda sensor
All petrol versions are fitted with this device. It ensures that air and fuel are constantly mixed in
the correct proportion. This is a fundamental condition for proper engine and catalytic converter
operation.
Fuel evaporation canister
As it is impossible to stop the build up of petrol fumes, also when the engine is not running, the
system traps them in a special container holding active carbon. The fumes are sucked in from here
and burnt while the engine is running.