Emissions recall E22- reprogram the powertrain control module and inspection of the catalytic converter.
In short "the powertrain control module (PCM) contains software that may not be capable of detecting a deterioating catalyst. This can result in failure to illuminate the on-board diagnostic (OBD) malfunction indicator light (MIL) warning the customer of a potential problem."
Also some catalytic converters may degrade and start to rattle, resulting in higgher emissions and illumination the (MIL).
It says... "certain 1996 model year Jeep Cherokee and Grand Cherokee equiped with 4.0 liter engine. and certain 1997 and 1998 Jeep Wrangler and Cherokee and Dodge Dakotas equiped with 2.5 liter engines."
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