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Old 06-10-2021, 12:22 PM #1
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p0420 code again

2001 4runner....p0420 I did do a google search, maybe did it wrong.
have check engine light since I bought it.( 7 months now) and of course when it is on so is the VSC and Trac lights, sunday put in a new Denso 02 rear on, light stayed off for about 15 miniutes
so maybe I need a cat...which wont be soon.

however:
1) I have read about spaceing the 02 sensor out to get it out of the exhaust stream and thus turn the light off.....
2)My "drive" light on the dashboard is out...and someplace in the back of my mind I thought I read that this too can trigger the check engine light....which triggers the VSC lights to get your attention.


Can anyone point me to either of those threads ?

oh and if yoru ambitions...point me to the removeal of lower cam bolt removal for the front end, mine are frozen and need to be cut out and the shop I went to yesterday does not do that kind of stuff....cut out parts

thanks
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Old 06-10-2021, 12:53 PM #2
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"Drive" light, like when you're in D gear? Mine's never worked, and it doesn't
trigger P0420s. What apparently does (twice), at least on mine, is driving
around basically at an idle (it's all around town miles lately). When I turn off
overdrive and clear the code, the CEL doesn't come back.
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Old 06-10-2021, 01:27 PM #3
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I used o2 spacers in the past to eliminate the p0420 code when I had a bad cat on my Subaru and Camry. Passed emissions on both cars.
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Old 06-10-2021, 01:35 PM #4
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I updated my P0420 experience and have not had the CEL return. A simple exhaust leak due to a loose clamp. My 'D' selector bulb has been out since I bought the rig and is still out. I assumed this was just because it's the bulb that has seen the most use for 20 years - being in Drive most of the time.
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Old 06-10-2021, 03:53 PM #5
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Exhaust leaks and antifreeze cause most 420 codes.

Driving with a missfire and ruff running engine will overheat the Cat and melt the honeycomb.


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Old 06-10-2021, 05:28 PM #6
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Quote:
Originally Posted by 3bears View Post
2001 4runner....p0420 I did do a google search, maybe did it wrong.
have check engine light since I bought it.( 7 months now) and of course when it is on so is the VSC and Trac lights, sunday put in a new Denso 02 rear on, light stayed off for about 15 miniutes
so maybe I need a cat...which wont be soon.

however:
1) I have read about spaceing the 02 sensor out to get it out of the exhaust stream and thus turn the light off.....
2)My "drive" light on the dashboard is out...and someplace in the back of my mind I thought I read that this too can trigger the check engine light....which triggers the VSC lights to get your attention.


Can anyone point me to either of those threads ?

oh and if yoru ambitions...point me to the removeal of lower cam bolt removal for the front end, mine are frozen and need to be cut out and the shop I went to yesterday does not do that kind of stuff....cut out parts

thanks
Lower control arm removal issues

Yeah you can use a spark plug arrestor t get the o2 sensor out of the stream or you can also get the underdog urd o2 simulator and eliminate the code. Might be an issue required to pass emmisions.
P0420 could be frustrating diagnosis.
Cats would go bad if driven with misfire and overheat damaging the honey combs inside.
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Old 06-10-2021, 11:30 PM #7
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thanks guys
its prob a bad cat and I really dont want to replace right now. And actually with no insections up here...I would prob just put in a straight pipe. It does not seem to effect driving or running at all.now that winter is past and long warm ups etc are over im getting over 16mpg...thats why I thought of just getting the 02 out of the stream so the stinking lights would quit.

so is it the same thread as a spark plug for a plug extension ?

anybody got a link to doing that?
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Last edited by 3bears; 06-10-2021 at 11:34 PM.
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Old 06-10-2021, 11:38 PM #8
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Quote:
Originally Posted by spartacus View Post
Lower control arm removal issues

Yeah you can use a spark plug arrestor t get the o2 sensor out of the stream or you can also get the underdog urd o2 simulator and eliminate the code. Might be an issue required to pass emmisions.
P0420 could be frustrating diagnosis.
Cats would go bad if driven with misfire and overheat damaging the honey combs inside.

thanks for the link to timmy....but his came out easy...mine are frozen
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Last edited by 3bears; 06-11-2021 at 12:09 AM.
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Old 06-11-2021, 12:22 AM #9
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thanks for the link to timmy....but his came out easy...mine are frozen
The Sawzall method should work even on frozen cams.
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Old 06-12-2021, 12:09 AM #10
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Quote:
Originally Posted by 3bears View Post
2)My "drive" light on the dashboard is out...and someplace in the back of my mind I thought I read that this too can trigger the check engine light....which triggers the VSC lights to get your attention.


Can anyone point me to either of those threads ?

thanks
In my experience, having a light out in the dash can trigger the VSC/TRAC lights WITHOUT a check engine light. For me it was the D and P light on the dash. I actually used this as a VSC TRAC disable for a while before I could figure out my issue with the TRAC system.

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Old 06-12-2021, 02:20 AM #11
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Quote:
Originally Posted by spartacus View Post
Lower control arm removal issues

Yeah you can use a spark plug arrestor t get the o2 sensor out of the stream or you can also get the underdog urd o2 simulator and eliminate the code. Might be an issue required to pass emmisions.
P0420 could be frustrating diagnosis.
Cats would go bad if driven with misfire and overheat damaging the honey combs inside.

thanks again
i have not had a chance to road test tonight, but for those thinking of this option for the 420 code...
note this is for the rear sensor...
spark plug non-fouler ...doorman 42009 for 18mm ( got at autozone, orielleys listed the also, as well as amazon...not at napa)
5/8 drill bit ( had one, 1/2 is a touch too small)
the "sensor part of the 02 sensor will not fit in without drilling out the non-fouler. Since it came as a 2 pack, I drilled one, threaded it into the other so now my 02 sensor is actually 2 spacers away. crossing my fingers this shuts off the light

update : that worked...drove for an hour and no lights came on. In the past it was like 5 minutes.....thanks
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Old 06-12-2021, 09:13 PM #12
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Where I'm at, that spacer, urd, and ghetto resistor/capacitor add on would probably pass here too.
But if the inspector does a visual in that area and sees the jigs it would be an automatic no pass.
I seen a thread somewhere where the guy cut and shaved cat material, and he made it to slipped over the o2 probe, surrounding the sensor. From above it looks normal. Slick.
I miss cities with lax emissions such as Alaska.
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Old 06-13-2021, 12:28 PM #13
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I heard the newer models (not sure 01 is included) the manufactures are required to update the software to once in a while rich the engine and see the corresponding change is detected at the O2 sensor. The manufacturers know many are adding the spacer to go around the P0420 so here is the new update.

Eastern Catalytics make good converters too. I bought one for my 2000 LC and works great. 5 year 50K mile warranty included too.
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Old 06-13-2021, 01:44 PM #14
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Quote:
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I heard the newer models (not sure 01 is included) the manufactures are required to update the software to once in a while rich the engine and see the corresponding change is detected at the O2 sensor. The manufacturers know many are adding the spacer to go around the P0420 so here is the new update.

Eastern Catalytics make good converters too. I bought one for my 2000 LC and works great. 5 year 50K mile warranty included too.
hope mine does not....guess I will find out. Have about 2 hours on it now, about 1 hour freeway and one in running around town with constant shut offs/restarts and idling
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Old 06-13-2021, 01:46 PM #15
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Quote:
Originally Posted by HiLife View Post
Where I'm at, that spacer, urd, and ghetto resistor/capacitor add on would probably pass here too.
But if the inspector does a visual in that area and sees the jigs it would be an automatic no pass.
I seen a thread somewhere where the guy cut and shaved cat material, and he made it to slipped over the o2 probe, surrounding the sensor. From above it looks normal. Slick.
I miss cities with lax emissions such as Alaska.

yep no ispections here, I was just sick of looking at the dash light
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