One problem related to engine head gasket leaking has been reported for the 2001 Mitsubishi Diamante. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Mitsubishi Diamante based on all problems reported for the 2001 Diamante.
2001 Mitsubishi Diamante experienced problems with the heater core. The heater core had to be replaced because anti-freeze was leaking into the passenger compartment and fogging the windshield. When the heater core was being removed, the consumer noticed it failed to have sufficient insulation. The oil pan gasket was leaking and the upstream oxygen sensor was replaced.