8-VALVE 1.4
ENGINE
FIAT PUNTO TRAINING OUTLINE
Fiat Auto S.p.A.
After Sales Training
4.4.2 Oxygen sensor
Description
Two oxygen sensors are available: one upstream and one downstream the catalyst.
The oxygen sensor upstream the catalyst is used to check the combustion result. The control
unit analyzes its signal and corrects the stoichiometric ratio so as to always keep combustion
within the limits necessary for emissions.
The oxygen sensor downstream the catalyst is used to check the actual efficiency of the
catalyst: the control unit analyzes its signal and informs you of catalyst deterioration through
the MIL warning light.
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