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CEL Code 420 #600488 04/10/03 07:34 PM
Joined: Apr 2003 Posts: 19 9 96ContourLX OP New CEG\'er
OP 96ContourLX New CEG\'er 9 Joined: Apr 2003 Posts: 19	I posted something earlier about a cel code. 171 and 174. Those codes went away after replacing my front and rear oxygen sensor. for about a day the light stayed off and then it came back on. I got the code scanned and the mechanic told me that i have cel code 420. i when and searched for the code's info i found... [Catalyst System Efficiency below Limit - Bank No 1.] Does this mean i need a new cat. converter?

Re: CEL Code 420 #600489 04/10/03 10:24 PM
Joined: Oct 2002 Posts: 2,408 R Rogerm60 Hard-core CEG'er
Rogerm60 Hard-core CEG'er R Joined: Oct 2002 Posts: 2,408	It means your bank 1 precat is going bad. The lean condition you had was keeping the extra hydrocarbons from reaching the cats. It was bad before, but not being used enough to trigger a code. "Those who cannot remember the past are condemned to repeat it" -George Santayana

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