1995 Jeep Wrangler exhaust system problems

While parked the vehicle emergency brake failed which caused the vehicle to roll backwards and hit a van. The vehicles fuel sensor, oxygen sensor, tp sensor and exhaust manifold studs failed. The catalytic converter also rattled. *scc *nlm

I am the second owner of a 1995 wrangler. Through warranty, the catalytic converter was replaced in september 1999. Less than 15k miles later, I am told the converter must be replaced again. The dealer referred me to chrysler who have offered no assistance whatsoever. If I purchase a catalytic converter, I receive a one year warranty. Chrysler provides an 8 year warranty on it from the date of "in service" of the vehicle (1995).