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Re: P0420 Catalyst System Efficiency below Limit
#764520 10/08/03 05:10 PM
Joined: May 2000
Posts: 3,290
Falls Church, VA
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Viss1_dup1 Offline
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Viss1_dup1
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Joined: May 2000
Posts: 3,290
Falls Church, VA
FWIW, I got that code when I was still under the 70K warranty. Thought about swapping the O2 sensor to see if that was the problem, but said screw it since it was still under warranty. Took it to the dealer, they replaced the cat. No mention of O2 sensor replacement or anything.

E0 #36 '95 Ranger '82 Honda CX500
Re: P0420 Catalyst System Efficiency below Limit
#764521 10/09/03 02:33 PM
Joined: May 2000
Posts: 222
Fairport, NY, US
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goldsmi_dup1 Offline
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Fairport, NY, US
Got a P0420 today. Dealer says it's covered 8/80.

Found the text of TSB 01-9-7 which says, in part:

Do not replace downstream HO2S sensors (HO2S12/HO2S22) for DTCs P0420 and/or P0430: When diagnosing a vehicle with a customer concern of MIL On and DTCs P0420/P0430 in continuous memory, do not replace the downstream HO2S sensors (HO2S12/HO2S22). Damaged or malfunctioning downstream HO2S sensors will not cause these DTCs to be set. Always verify the vehicle concern, then perform the pinpoint diagnostics in the appropriate PC/ED Service Manual.


AL

Red '98 SVT E0 3098/6535 DMD other stuff and a Bullitt fuel door
Re: P0420 Catalyst System Efficiency below Limit
#764522 02/08/04 02:06 PM
Joined: Apr 2002
Posts: 888
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dbird_dup1 Offline
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no you dont clean it with a torch.. you test it with a torch... download this link, the manual for a multimeter by this company.. i shows you how to test the sensors....
go to www.actron.com and download their manuals for the test equipment and you will see how to test it with a multimeter( a plain old voltage/ohm meter)....
http://www.actron.com/cp7680.pdf
this is the link for one of them........

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