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05-22-2007, 10:47 PM
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#1 | |
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AF Newbie
Join Date: May 2007
Location: Bowdoinham, Maine
Posts: 2
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1998 Pontiac Transport Engine code P0420
The check engine light intermittantly comes on. Only code showing is P0420 which is catalytic efficiency. Replaced catalytic converter six months ago after this code started showing up and it stopped for 6 months. Now its back. Car has 160K miles on it. suspect it is time to replace the aft O2 sensor (behind the converter) but wanted some other opinions.
Also, what about removing the converter altogether. We live in a state that has no smog check. Will removal of the converter cause the catalytic efficiency test to always fail? All opinions welcome. Thanks |
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05-23-2007, 09:50 AM
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#2 | |
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A990 racer
 Join Date: Mar 2002
Location: Chestertown, New York
Posts: 17,051
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Re: 1998 Pontiac Transport Engine code P0420
Yes it will keep the lite on , plus removal is a Federal offense. Do a site search for the code, lots of info. A good test for cat operation is to get the engine hot, using an infrared thermometer check inlet vs outlet temps, outlet should be about 100 degrees higher.
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