Code P0420: Catalyst Efficiency Below Threshold
NOTE:
For component terminal identification, see TERMINAL IDENTIFICATION in this article. For wiring diagrams, see WIRING DIAGRAMS in the WIRING DIAGRAMS section.
No specific self-diagnostic test is provided by manufacturer. Check catalytic converter and check for cracked exhaust manifold. Also, see BASIC TESTING - 2.4L and SYSTEM/COMPONENT TESTS - 2.4L articles.