Check engine light on…. by Just Jeeps | Dec 20, 2011 | Uncategorized | 0 comments Catalytic convertor failure on a 2002 Jeep Grand Cherokee. Unfortunately you have to replace both upstream catalysts at the same time. Submit a Comment Cancel reply Your email address will not be published. Required fields are marked * Name * Email * Website Comment You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong> Notify me of follow-up comments by email. Notify me of new posts by email.