Catalytic Converter - Volvo S40 Owner's Manual

Technical data

Catalytic converter

General
The purpose of the catalytic converter is to
purify exhaust gases. It is located in the flow
of exhaust gasses close to the engine so that
it quickly reaches operating temperature. The
catalytic converter consists of a monolith
(ceramic or metal) with channels. The
channel walls are lined with a thin layer of
platinum, rhodium and palladium. These
metals act as catalysts, i.e. they participate in
and accelerate a chemical reaction without
being used up themselves.
220
TM
Lambda-sond oxygen sensor
The Lambda-sond is part of a control system
intended to reduce emissions and improve
fuel economy.
An oxygen sensor monitors the oxygen
content of the exhaust gases leaving the
engine. This value is fed into an electronic
system that continuously controls the
injectors. The ratio of air to fuel is continu-
ously adjusted. These adjustments create
optimal conditions for efficient combustion,
and together with the three-way catalytic
converter reduce harmful emissions (hydro-
carbons, carbon monoxide and nitrous
oxides).