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Old 05-09-11, 10:00 AM   #1
Abdiel
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Exclamation Code p0420 96 ls400

my check engine light recently came on and is the code P0420 Catalyst System Efficiency Bellow Threshold Bank 1.. any help would help thanks
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Old 05-09-11, 10:29 AM   #2
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search. common issue, rarely serious. usually an exhaust leak.
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Old 06-09-11, 04:42 PM   #3
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is there some kind of diy for the exhaust system?
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Old 06-09-11, 04:51 PM   #4
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its a leak. look for it. what kind of DIY would you want
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3. Black 2004 IS300 -Manaray-HKS-Eibach-Kumho-
4. Ebony Teal 1995 LS400 11-8-06
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Old 06-09-11, 09:15 PM   #5
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My egr pipe is cracked and I occasionally get the same code. I just clear it and it comes back in about a month. Just been putting it off for a year at least hah.
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Old 06-09-11, 09:45 PM   #6
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I believe that was the code I had on my 96 and it was a leaky exhaust. It was on a bend and just old age rusted through. Try to find a shop that won't insist on changing out the catalyst, just custom make a new pipe section and weld it in.

Climb under and start listening and feeling for the leak, should be easy to find. Mine was under the heat shield:
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Code p0420 96 ls400-dscn2635.jpg  

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Old 06-10-11, 10:09 AM   #7
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thanks i changed my egr about 2 months ago but i will go to a shop today and have them check it for me thanks.
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1995, 2006, 400, catalyst, code, efficiency, is250, lexus, ls, ls400, lx470, p0420, p420, po420, system

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