For 1990-2009 cars

# SMU - Revised DTC P0420 Catalyst System Low Efficiency

Subject: | Revised DTC P0420 Catalyst System Low Efficiency

Models: | 1996-2001 Chevrolet/Geo Metro

| 1996-2004 Chevrolet/Geo Tracker

| 1996-1997 Pontiac Sunrunner

| 1996-2001 Pontiac Firefly

Built with the following engines:

Engine | Model Year | Model
--- | --- | ---
1.0L Engine VIN 6 -- RPO LP2 | 1996-2000 | Chevrolet/Geo Metro Pontiac Firefly
1.3L Engine VIN 9 -- RPO L72 | 1997 | Geo Metro Pontiac Firefly
1.3L Engine VIN 2 -- RPO LY8 | 1998-2001 | Chevrolet Metro Pontiac Firefly
1.6L Engine VIN 6 -- RPO L01 | 1996-1997 | Pontiac Sunrunner
1996-2002 | Chevrolet/Geo Tracker
2.0L Engine VIN C -- RPO L34 | 1999-2004 | Chevrolet Tracker
2.5L Engine VIN 4 -- RPO LE8 | 2001-2004 | Chevrolet Tracker

This bulletin is being issued to revise Step 8 of DTC P0420 Catalyst System Low Efficiency in the Engine Controls sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
8 | Important: Before installing the replacement converter, locate and repair the cause of the TWC converter failure. Replace the three-way catalytic converter and the warm-up three-way catalytic converter (WU-TWC), if equipped. Is the action complete? | -- | Go to Step 10 | --