P0420 Coded

97Blk_one · 11-07-2009, 05:06 AM

Hello Everyone

Sorry haven't been in here for months. Yesterday my truck "Check Engine Light" come on.I went to Autozone, and got it scanned. The code:

P0420

Bank-1(Heated Oxygen Sensor)
Faulty Catalytic Converter

I've search on here about the code P0420, couldn't find any ? Any help would be greatly appreciated. Oh,one more If I decided to do one of the above stated where would I start ? thanks

98tacoma27 · 11-07-2009, 05:18 AM

Start with that O2/AFR sensor. If that doesn't fix it then you have two options: new CAT or O2 simulator.

98tacoma27 · 11-07-2009, 05:19 AM

And double check for any exhaust leaks

97Blk_one · 11-07-2009, 05:35 AM

Thanks'98. How hard is it to take that sensor off, Where would I begin? Thanks

chris4x4 · 11-07-2009, 06:02 AM

Quote:

Originally Posted by 97Blk_one

Thanks'98. How hard is it to take that sensor off, Where would I begin? Thanks

Its not hard. Its the sensor closest to the engine on the exhaust....Near the firewall. I belive 2 10 mm bolts, and then unplug it. Its tight in there to get to the plug, so take your time.

97Blk_one · 11-07-2009, 07:45 AM

Thanks Chris, I try to locate it.

98tacoma27 · 11-07-2009, 07:45 AM

4 or six banger?

97Blk_one · 11-07-2009, 07:57 AM

Is this it?

It's a 4, got 114,821 miles on it. This is the first time I got that "Check Engine Light" on. I was trying to see If I can fix it myself. I don't wanna take it to the stealer. Hopefully you guys and gals can help a brother out.

98tacoma27 · 11-07-2009, 08:02 AM

That would be Sensor 2. Sensor one will be before the CAT. The code doesn't specify exactly which sensor may be bad. It just says the the two sensors are reporting very similar readings back to the ECU. Sensor 1 should be reporting a waveform while Sensor 2 is generally flatter.

http://www.obd-codes.com/p0420

97Blk_one · 11-07-2009, 08:08 AM

oh..Thanks for the link'98. It's should help a dummy like myself out

. Thanks again

98tacoma27 · 11-07-2009, 08:11 AM

I can't guaranty that changing the sensor(s) will clear your issue though.

97Blk_one · 11-07-2009, 08:14 AM

Quote:

Originally Posted by 98tacoma27

I can't guaranty that changing the sensor(s) will clear your issue though.

That's good n'ouf for me,sir. I just can't drive with that "Check Engine Light " on, it's irritated the craps out of me

98tacoma27 · 11-07-2009, 08:16 AM

Download the FSM if you don't have it already. There should be a section that deals with the code.

jbob · 11-07-2009, 08:20 AM

catalyst efficiency below threshold,bad convertor........sorry.

98tacoma27 · 11-07-2009, 08:20 AM

http://www.ncttora.com/fsm/2003/Repa...e3/cip0420.pdf

That's for the 2RZ/3RZ, The 5VZ is the same as far as the troubleshooting goes.

97Blk_one · 11-07-2009, 08:29 AM

Appreciated all the helps '98 and jbob !

jbob · 11-07-2009, 08:33 AM

welcome!

EverTaco23 · 11-07-2009, 10:25 AM

I had the same code last week. and it was infact the AFR sensor. Sensor 1
I took it out and it was sooper black and filthy. changed it out from one from RockAuto.com and it is running better and no more CEL,

97Blk_one · 11-08-2009, 03:57 PM

Quote:

Originally Posted by EverTaco23

I had the same code last week. and it was infact the AFR sensor. Sensor 1
I took it out and it was sooper black and filthy. changed it out from one from RockAuto.com and it is running better and no more CEL,

Thank Taco23. I'll try that.

11-07-2009, 05:06 AM	#1
97Blk_one Senior Member Joined: Apr 2008, #5970 Location: Memfrica Posts: 359 not so low 1997 Access Cab A whole lot,But not satify	P0420 Coded Hello Everyone Sorry haven't been in here for months. Yesterday my truck "Check Engine Light" come on.I went to Autozone, and got it scanned. The code: P0420 Bank-1(Heated Oxygen Sensor) Faulty Catalytic Converter I've search on here about the code P0420, couldn't find any ? Any help would be greatly appreciated. Oh,one more If I decided to do one of the above stated where would I start ? thanks __________________ Irregularity is an artform Lowed with Coilsprings 2" front, back block 4" Clear lens,markers,Tail Lamps,Sir Michael Roll Pan,Stubbie chrome Antenna,Window visors,Chrome Grille,Valances,Hard Top Leer Tonneau Cover,Slot drilled brake Calipers,Extreme Performance Brake Pads,Toxic Drop Shocks,ICW Racing Wheels,Nankang 245/40R18 rubbers,Wet Okole seat covers, Sony Head Unit, Sony and Pioneer Speakers

11-07-2009, 05:35 AM	#4
97Blk_one Senior Member Joined: Apr 2008, #5970 Location: Memfrica Posts: 359 not so low 1997 Access Cab A whole lot,But not satify	Thanks'98. How hard is it to take that sensor off, Where would I begin? Thanks __________________ Irregularity is an artform Lowed with Coilsprings 2" front, back block 4" Clear lens,markers,Tail Lamps,Sir Michael Roll Pan,Stubbie chrome Antenna,Window visors,Chrome Grille,Valances,Hard Top Leer Tonneau Cover,Slot drilled brake Calipers,Extreme Performance Brake Pads,Toxic Drop Shocks,ICW Racing Wheels,Nankang 245/40R18 rubbers,Wet Okole seat covers, Sony Head Unit, Sony and Pioneer Speakers

11-07-2009, 07:45 AM	#6
97Blk_one Senior Member Joined: Apr 2008, #5970 Location: Memfrica Posts: 359 not so low 1997 Access Cab A whole lot,But not satify	Thanks Chris, I try to locate it. __________________ Irregularity is an artform Lowed with Coilsprings 2" front, back block 4" Clear lens,markers,Tail Lamps,Sir Michael Roll Pan,Stubbie chrome Antenna,Window visors,Chrome Grille,Valances,Hard Top Leer Tonneau Cover,Slot drilled brake Calipers,Extreme Performance Brake Pads,Toxic Drop Shocks,ICW Racing Wheels,Nankang 245/40R18 rubbers,Wet Okole seat covers, Sony Head Unit, Sony and Pioneer Speakers

11-07-2009, 07:57 AM	#8
97Blk_one Senior Member Joined: Apr 2008, #5970 Location: Memfrica Posts: 359 not so low 1997 Access Cab A whole lot,But not satify	Is this it? It's a 4, got 114,821 miles on it. This is the first time I got that "Check Engine Light" on. I was trying to see If I can fix it myself. I don't wanna take it to the stealer. Hopefully you guys and gals can help a brother out. __________________ Irregularity is an artform Lowed with Coilsprings 2" front, back block 4" Clear lens,markers,Tail Lamps,Sir Michael Roll Pan,Stubbie chrome Antenna,Window visors,Chrome Grille,Valances,Hard Top Leer Tonneau Cover,Slot drilled brake Calipers,Extreme Performance Brake Pads,Toxic Drop Shocks,ICW Racing Wheels,Nankang 245/40R18 rubbers,Wet Okole seat covers, Sony Head Unit, Sony and Pioneer Speakers

11-07-2009, 08:08 AM	#10
97Blk_one Senior Member Joined: Apr 2008, #5970 Location: Memfrica Posts: 359 not so low 1997 Access Cab A whole lot,But not satify	oh..Thanks for the link'98. It's should help a dummy like myself out . Thanks again __________________ Irregularity is an artform Lowed with Coilsprings 2" front, back block 4" Clear lens,markers,Tail Lamps,Sir Michael Roll Pan,Stubbie chrome Antenna,Window visors,Chrome Grille,Valances,Hard Top Leer Tonneau Cover,Slot drilled brake Calipers,Extreme Performance Brake Pads,Toxic Drop Shocks,ICW Racing Wheels,Nankang 245/40R18 rubbers,Wet Okole seat covers, Sony Head Unit, Sony and Pioneer Speakers

11-07-2009, 08:20 AM	#14
jbob shake & bake Joined: Oct 2009, #25056 Location: bama Gender: Dude Posts: 2,033 09 dc 4x4 bama taco 2009 Double Cab Automatic 4.0 step bars,vent visors	catalyst efficiency below threshold,bad convertor........sorry.

11-07-2009, 08:29 AM	#16
97Blk_one Senior Member Joined: Apr 2008, #5970 Location: Memfrica Posts: 359 not so low 1997 Access Cab A whole lot,But not satify	Appreciated all the helps '98 and jbob ! __________________ Irregularity is an artform Lowed with Coilsprings 2" front, back block 4" Clear lens,markers,Tail Lamps,Sir Michael Roll Pan,Stubbie chrome Antenna,Window visors,Chrome Grille,Valances,Hard Top Leer Tonneau Cover,Slot drilled brake Calipers,Extreme Performance Brake Pads,Toxic Drop Shocks,ICW Racing Wheels,Nankang 245/40R18 rubbers,Wet Okole seat covers, Sony Head Unit, Sony and Pioneer Speakers

11-07-2009, 08:33 AM	#17
jbob shake & bake Joined: Oct 2009, #25056 Location: bama Gender: Dude Posts: 2,033 09 dc 4x4 bama taco 2009 Double Cab Automatic 4.0 step bars,vent visors	welcome!

11-07-2009, 10:25 AM	#18
EverTaco23 Senior Member Name: Evan Joined: Feb 2008, #4544 Location: Brush Prairie, WA. Age: 23 Gender: Male Posts: 1,922 02 TRD 4wd DC 2002 Double Cab Automatic 3.4L V6 A Bunch of Stuff!!! Listed in Sig.	I had the same code last week. and it was infact the AFR sensor. Sensor 1 I took it out and it was sooper black and filthy. changed it out from one from RockAuto.com and it is running better and no more CEL, __________________ ~2002 TRD4x4 DC~ Toytec Ultimate 3" lift kit + 1" block in rear, Total Chaos UCA's, K&N CAI with AFE filter, Dynomax muffler, TRD Headers, Grey Wire mod, Tom Woods DS, 285/75/16 BFG A/T's on Pro Comp 8069's, Power Slotted Rotors w/Hawk LTS pads, Wheelers Brake Lines, Tinted Windows, Black Tool Box, Black Bed X-tender, New Sound system/Ipod jack, Infiniti Speakers, Custom Sub box w/2 8" Premier Subs, JBL 350w Amp, Yakima Roof Rack and Snowboard Rack.

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