Jeep Cherokee

 Service Manual

Exhaust system » Description and operation
Catalytic converters

DESCRIPTION

California emissions vehicles incorporate two mini catalytic converters into the exhaust system. These catalytic converters are made of stainless steel designed to operate at extremely high temperatures.

The stainless steel catalytic converter body is designed to last the life of the vehicle. Excessive heat can result in bulging or other distortion, but excessive heat will not be the fault of the converter. If unburned fuel enters the converter, overheating may occur. If a converter is heat-damaged, correct the cause of the damage at the same time the converter is replaced. Also, inspect all other components of the exhaust system for heat damage.

Unleaded gasoline must be used to avoid contaminating the catalyst core.

Fig. 4 4.0L Catalytic Converter and O2 Sensor Configuration-(California Emissions only)

1 - O2 SENSOR
2 - O2 SENSOR
3 - O2 SENSOR
4 - O2 SENSOR
5 - O2 SENSOR
6 - O2 SENSOR

Federal emission vehicles use only one catalytic converter, However, California emission vehicles incorporate two mini catalytic converters located after the exhaust manifolds and before the inline catalytic converter (Fig. 4).

Exhaust system

Catalytic converters

Muffler

Tailpipe