P0420, and luck with converter clean products? - JeepForum.com
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post #1 of 17 Old 11-01-2019, 08:27 AM Thread Starter
02Lightning
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P0420, and luck with converter clean products?

I've had this code for a while, and the engine light will go on and off. Anyone try the converter clean products? My guess is it won't work, but you never know.


2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 166,000 miles
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post #2 of 17 Old 11-01-2019, 08:40 AM
jtec
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why not address the code - WHY is PCM setting this code?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 17 Old 11-01-2019, 10:26 AM
Double E
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+1^.
It's a code that occurs for a reason and a "fix in a bottle" hope is not what it is asking for.

https://www.jeepforum.com/forum/f310...hread-1375231/

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post #4 of 17 Old 11-01-2019, 11:08 AM Thread Starter
02Lightning
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It's a California emissions converter, and I don't want to spend $400 plus on it if I don't have to.
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post #5 of 17 Old 11-01-2019, 12:13 PM
jtec
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why do you think converter is bad?

Sure it is a likely outcome BUT what and why are the questions. Taking a look wont hurt.

just because its calif emissions it may NOT require a CARB compliant part.

Are you in lala land?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 17 Old 11-01-2019, 12:55 PM Thread Starter
02Lightning
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Quote:
Originally Posted by jtec View Post
why do you think converter is bad?

Sure it is a likely outcome BUT what and why are the questions. Taking a look wont hurt.

just because its calif emissions it may NOT require a CARB compliant part.

Are you in lala land?
I've replaced the o-rings on the injectors, new 02 sensors (NKG) and manifold gasket. No leaks in the exhaust. No loose parts in the converter and it runs fine. I'm sure the jeep is calibrated for California converters, and I bet if I replace with any old converter it will give me more codes. I replaced the crank and rod bearings recently and it's up on all it's maintenance. I would rather put some more miles on it, to feel like I got my moneys worth out of all the work I put into it, before spending $400 plus more. I don't usually put band aids on stuff, but I don't like being under water on it either. Plus my rear main is leaking worse than before I replaced it. Also just had the dash out replacing the heater core and evap. core. La la land, I don't follow?

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post #7 of 17 Old 11-02-2019, 08:01 AM
jtec
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stop guessing.

check if system is California emissions.
OK the CEL is on the key dance shows p0420 - get a free scan and look at ALL codes.
Maybe knowing all codes will paint a mental picture of issues.

Look at the decal on radiator support or look at exhaust system.
look at cats, o2 sensors what 2minutes?

Drive to auto part store for scan - take a drive hard work there and 15minutes at store.

SORRY
I have been told I expect to much or get overly technical

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #8 of 17 Old 11-02-2019, 08:53 AM Thread Starter
02Lightning
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What am I guessing at? It's absolutely California emissions, sticker says so. I have a cheap blue tooth scan tool, P0420 is the only code. The o-rings on the injectors and the manifold gasket were a result of "while I have the motor out", they are cheap and may as well replace it to eliminate them while I'm here. The replacement of the 02 sensors were because they had 160k on them, and when I graphed them, B1S1 looked kind of flat compared to the rest, but I don't know what I'm really looking at here. There are three converters on the jeep, B1S1 & B2S2 before the two converters, B1S2 & B2S2 after the two converters. Then no sensor after the converter under the floor. There are no holes in the exhaust. The only other thing I can think of is a leaky or bad injector on the front bank. I could pull them off and swap them around and see if the code follows the injectors, but I may have moved them around replacing the o-rings, I'm not sure. I usually don't use additives for anything, because I think they are mostly snake oil, but I thought who knows, may work. On I side note here, prior to replacing the 02 sensors I had a spacer on B1S2 and the code went away.

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post #9 of 17 Old 11-03-2019, 07:45 AM
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I kept getting this code, I replaced my front (upstream) o2 sensors, haven't had the light come on since..........

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post #10 of 17 Old 11-03-2019, 11:18 AM Thread Starter
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Quote:
Originally Posted by scott_0 View Post
I kept getting this code, I replaced my front (upstream) o2 sensors, haven't had the light come on since..........
Wish I could say the same, done that.

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post #11 of 17 Old 11-05-2019, 12:48 PM
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p0420 cat below threshold. Does your scan tool run live. Your 2nd O2 sensor should read pretty stable. I just had the same problem. It was running pretty rich and fouled out the cats. I ran a couple cans of injector cleaner through is. Replaced the O2 sensors. That fixed the running rich problem. Then I replaced cats. Mine has Cal. emissions, and Low Emissions Vehicle. I had the same questions, I talked to the guys at Walker and they said the non CARB cats are fine. 2 months with no codes, and runs like a top. I really like the fitment of the walkers. What everyone said though was to fix the problem that caused the cats too foul first.
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post #12 of 17 Old 12-04-2019, 11:19 AM
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Quote:
Originally Posted by vosevichs View Post
p0420 cat below threshold. Does your scan tool run live. Your 2nd O2 sensor should read pretty stable. I just had the same problem. It was running pretty rich and fouled out the cats. I ran a couple cans of injector cleaner through is. Replaced the O2 sensors. That fixed the running rich problem. Then I replaced cats. Mine has Cal. emissions, and Low Emissions Vehicle. I had the same questions, I talked to the guys at Walker and they said the non CARB cats are fine. 2 months with no codes, and runs like a top. I really like the fitment of the walkers. What everyone said though was to fix the problem that caused the cats too foul first.
420 just popped up on our 04 and since i live in Delaware and not CA, NY or Maine was thinking of going that route but wasn't sure it wouldn't throw codes. I do still need to replace my front sensors as I'm hoping that's all it is from since it came after I did the rears. Already bought all 4 just haven't had a chance to do the fronts
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post #13 of 17 Old 12-05-2019, 06:10 AM Thread Starter
02Lightning
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Quote:
Originally Posted by GTP231 View Post
420 just popped up on our 04 and since i live in Delaware and not CA, NY or Maine was thinking of going that route but wasn't sure it wouldn't throw codes. I do still need to replace my front sensors as I'm hoping that's all it is from since it came after I did the rears. Already bought all 4 just haven't had a chance to do the fronts
That could very well be your problem is mismatched 02 sensors. I hear Jeeps are pretty finicky with 02 sensors. I replaced mine with NKG, but my problem still persists. The engine light is off right now, but the only code in the system is the pending P0420 code. My only guess right now short of replacing the converters would be a dirty fuel injector.

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post #14 of 17 Old 12-06-2019, 10:21 AM
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I have had about 60% success with Cataclean. Used it many times. Fixed the 420 code in my 01 4.7. Worth the $20 to give it a try in my book.

4 Door Jeeps Deserve Waves Too.
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post #15 of 17 Old 12-06-2019, 08:24 PM
DailybeaterWJ
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I found that the p0420 code is for the upstream o2 sensor
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