At 05:48 PM 8/12/03 -0400, you wrote:
>I get the following error on my 1998 V6 with 77,000 mile
>P0420 Catalyst System Efficiency Below Threshold Bank 1
>
>Is it time to replace the Cat of the O2 sensor? Is there something I can
>check or monitor that will help me. I have an OBD II scanner from
>www.obd-2.com
You can try injecting some propane into the throttle intake and watch
how the two O2 sensors respond on the scanner. If their outputs are identical,
then there's a good chance that the converter will need replacing. HTH.
Bob
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