Neon R/T L4-2.0L VIN F HO (2001)
An under-floor catalytic converter is used on all three converter packages; National Low Emission Vehicle (NLEV), Ultra Low Emission Vehicle
(ULEV), and the High Output engine. On the ULEV emission package, in addition to the under floor converter, a close-coupled catalytic converter is
used. This converter is integral to the exhaust manifold
CAUTION: Due to exterior physical similarities of some catalytic converters with pipe assemblies, extreme care should be taken with replacement
parts.
An exhaust flex-joint coupling secures the catalytic converter to the exhaust manifold by using four fasteners and a gasket for sealing. The flex-joint is
serviced with the catalytic converter.
CAUTION: When servicing the catalytic converter, care must be exercised not to dent or bend the bellows or bellows cover of the flex-joint. Should
this occur, the flex-joint will eventually fail and require the catalytic converter be replaced.
OPERATION
The three-way catalytic converter simultaneously converts three exhaust emissions into harmless gases. Specifically, HC and CO emissions are
converted into water (H20) and carbon dioxide (C02) Oxides of Nitrogen (NOx) are converted into elemental Nitrogen (N) and water. The three-way
catalyst is most efficient in converting HC, CO and NOx at the stoichiometric air fuel ratio of 14.7:1.
The oxygen content in a catalyst is important for efficient conversion of exhaust gases. When a high oxygen content (lean) air/fuel ratio is present for
