Lancia Y Owner's Handbook Manual page 7

DEVICES FOR REDUCING ENGINE EMISSIONS
Three-way catalytic converter (catalytic exhaust pipe)
Carbon monoxide, nitrogen oxides and unburnt hydrocarbons are the main harmful components in
exhaust gases.
The catalytic exhaust pipe and the devices connected to it are a "miniature laboratory" where a very
high percentage of these components are converted into harmless substances.
This conversion is aided by minute particles of precious metals on the ceramic core enclosed in the
stainless-steel container.
Lambda sensors
All are fitted with these devices. They ensure that air and fuel are constantly mixed in the correct pro-
portion. This is a fundamental condition for proper engine and catalytic converter operation.
Evaporation control systems
As it is impossible to stop the build-up of petrol fumes even when the engine is not running, the sys-
tem traps them in a special container holding active carbon. They are sucked in from here and burnt
while the engine is running.