LEMON Manuals: Even more car manuals for everyone
Home >> Acura >> 2001 >> 3.2CL Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Performance System Self-Diagnostics) >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold >> 3.2CL

DTC P0420: Catalyst System Efficiency Below Threshold: 3.2CL

WARNING: This page is about a different car, the 2003 Acura 3.2TL and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and run at 3000 RPM, with no load (in park or neutral) until radiator fan comes on.
  2. Connect scan tool to DLC. Test drive vehicle at 40-55 MPH for about 2 minutes. Decelerate with throttle completely closed for at least 3 seconds. Reduce speed to 35 MPH and try to hold until scan tool indicates FAIL or PASS as Three Way Catalytic Converter (TWC) test result. If test result is FAIL, check TWC and replace if necessary. If test result is PASS, problem is intermittent. System is okay at this time.
scientia non olet · About LEMON Manuals