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  #1  
Old 07-16-2009, 04:45 AM
lou lemons lou lemons is offline
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Lightbulb p0420 code

i got a check engine lite today the code was P0420 (M) 1/1 Catalytic Converter Efficiency Catalyst 1/1 efficiency below required level. anyone know what can cause this and how can i cure it thanks alot
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  #2  
Old 07-16-2009, 09:04 AM
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modain modain is offline
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Taken from the Powertrain Diagnostic Manual.

Symptom List:
P0420-CATALYST 1/1 EFFICIENCY
P0430-CATALYST 2/1 EFFICIENCY

Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0420-CATALYST 1/1 EFFICIENCY.

When Monitored and Set Condition:

P0420-CATALYST 1/1 EFFICIENCY

When Monitored: After engine warm up to 70°C (158°F), 180 seconds of open throttle operation, at a speed greater than 18 mph and less than 55 mph, with the engine at 1200-1700 rpm and MAP vacuum between 15.0 and 21.0 inches of mercury (Hg).

Set Condition: As catalyst efficiency deteriorates, the switch rate of the downstream O2 sensor approaches that of the upstream O2 sensor. If at any point during the test the switch ratio reaches a predetermined value a counter is incremented by one.

P0430-CATALYST 2/1 EFFICIENCY

When Monitored: Engine running.
Set Condition: The Powertrain Control Module doesn’t recognize the Catalytic Converter warming up efficiently.

POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
VISUALLY INSPECT CATALYTIC CONVERTER
EXHAUST LEAK
ENGINE MECHANICAL CONDITION
AGING O2 SENSOR
CATALYTIC CONVERTER
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2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, HO Cams, 2003 Intake Manifold, Dwight's 65mm TB, 3.92 LSD, R/T rear swaybar, no chrome
2001 Patriot Blue Durango SLT, 4.7L, 545RFE, Superchips 3715, Fastman 68mm TB, Jeep GC TCM, R/T rear swaybar, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, Jeep 4.0L TB, 3.92 LSD


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  #3  
Old 07-16-2009, 04:31 PM
Firebb15 Firebb15 is offline
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Ya my 2000 4.7 (cali emissions) has the same code...
"Catalyst System Efficiency Below Threshold"
My scanner told me both of my pre-cat 02's were bad...
b1/s1 and b2/s1...I replaced them with pre-cat 02's from an 06 ram. (had them on a spare engine) This is when it gave me that "Catalyst System Efficiency Below Threshold" code. Coincidence? I don't know, I wouldn't think pre-cat 02's would cause that code. Post-cat 02's would.
My guess would be your post 02's are going, or your cat is going.
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Last edited by Firebb15; 07-16-2009 at 04:33 PM. Reason: forgot some info
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  #4  
Old 07-18-2009, 09:54 AM
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modain modain is offline
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If the front O2s are changed out and the rear ones are old it will oftentimes trip the P0420/P0430 MIL code. Best practice is to change the rears when changing the fronts to keep them from reporting the MIL code (because they get lazy).
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2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, HO Cams, 2003 Intake Manifold, Dwight's 65mm TB, 3.92 LSD, R/T rear swaybar, no chrome
2001 Patriot Blue Durango SLT, 4.7L, 545RFE, Superchips 3715, Fastman 68mm TB, Jeep GC TCM, R/T rear swaybar, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, Jeep 4.0L TB, 3.92 LSD


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  #5  
Old 04-04-2011, 05:53 PM
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DALTON DALTON is offline
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is there any reason to throw a panic and hit up the parts stores for a couple sensors with a p0420?? or is it the obd2 scanner tellin me i need more weed... 420 lol


here's my problem...

had to edit this because i had forgot to say i have no cats, somebody.... cough cough, cut them out and put piece of pipe in its place.. the sensors are still there of course...

I only ever got this error once... my truck used to be the check engine light nightmare, but i came to its rescue and this site quite a few times and managed to get her all fixed up right... thanks by the way!!! to everyone.

I havent seen a light in weeks which I was very happy....

I Bought this off somebody who claimed to be a mechanic, and it was the worst tooken' care of vehicle I have ever seen..... but thank good i love my truck and I changed some diapers!!!

Its a sharp lookin truck in my opinion, and now it is finally time for somebody work... I was trying to iron out the wrinkles first....


Thanks in advance

Last edited by DALTON; 04-04-2011 at 06:06 PM. Reason: had to edit this because i had for got to say i have no cats cut them out and have piece of pipe but the sensors are still th
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