02-09-2015, 10:37 AM
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#1
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Join Date: Jan 2014
Location: Virginia
Posts: 128
Real Name: Ned
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Real Name: Ned
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Simultaneous P0031 and P0051 Codes
Hey guys, I've done a good bit of research and the only similar case I could find was with a 2nd gen tacoma but I was wondering if the 4runner V8 could have the same issue. I bought a 2005 V8 with 100K this weekend and spent the next day swapping out all the parts from my previous 4runner most notably a k&n CAI. Everything went on fine and fired up but then I got the check engine, vsc and trac lights. Went to advanced and pulled the codes, P0031 and P0051. I'm wondering if anyone else has gotten these codes simultaneously as it seems odd they would all go bad at once. Is it possible it is just a fuse or something in the ECU? All help appreciated.
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01-29-2017, 04:49 PM
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#2
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Join Date: Dec 2005
Location: Camp Hill, PA
Age: 43
Posts: 73
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Member
Join Date: Dec 2005
Location: Camp Hill, PA
Age: 43
Posts: 73
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Quote:
Originally Posted by edwardvmassey
Hey guys, I've done a good bit of research and the only similar case I could find was with a 2nd gen tacoma but I was wondering if the 4runner V8 could have the same issue. I bought a 2005 V8 with 100K this weekend and spent the next day swapping out all the parts from my previous 4runner most notably a k&n CAI. Everything went on fine and fired up but then I got the check engine, vsc and trac lights. Went to advanced and pulled the codes, P0031 and P0051. I'm wondering if anyone else has gotten these codes simultaneously as it seems odd they would all go bad at once. Is it possible it is just a fuse or something in the ECU? All help appreciated.
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Did you ever figure out the cause? Just hit this myself.
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01-29-2017, 05:18 PM
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#3
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Senior Member
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Join Date: Mar 2016
Location: Massachusetts
Posts: 1,183
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Quote:
Originally Posted by sibanez
Did you ever figure out the cause? Just hit this myself.
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those are the A/F sensors . upstream of cat converter. these burn out . the heater in them has to create very high temps so if you do too much idling it will burn them up. can also be a fuse blew for the a/f heater circuit. if you remove the sensor measure the heater resistance ..sensor wire could have shorted out also.
I had this happen on a 2007 V8 T4R limited ..
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01-29-2017, 05:24 PM
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#4
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Member
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Join Date: Dec 2005
Location: Camp Hill, PA
Age: 43
Posts: 73
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Join Date: Dec 2005
Location: Camp Hill, PA
Age: 43
Posts: 73
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Thank you, very helpful.
So, first thing is to check the fuse, then the relay and if both are good, then the O2 sensor?
How do you measure the heater resistance?
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01-29-2017, 08:27 PM
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#5
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Senior Member
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Join Date: Mar 2016
Location: Massachusetts
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Quote:
Originally Posted by sibanez
Thank you, very helpful.
So, first thing is to check the fuse, then the relay and if both are good, then the O2 sensor?
How do you measure the heater resistance?
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use ohm meter should be low resistance about 15-30 ohms..
a typical O2 sensor operates at 750 deg f. these a/f sensors run at 1000deg F.
so if you idle too long esp on cold start that relay keeps these powered up to make sure they are at that high temp... 4 wires on them I forget what colors 2 wires is to the heater ,but you should get it ...
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04-19-2017, 06:52 PM
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#7
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Join Date: Nov 2016
Location: South Carolina
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Real Name: Skip
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Quote:
Originally Posted by Slam95d
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Your issue was very frustrating for sure, GREAT job on your persistence and research to solve it, thanks for posting, I have book marked your web page for future use...god forbid that I ever need it, but I will for sure pass the link along if I see anyone else needing help with these codes coming up simultaneous!!
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2004 Limited V8
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04-20-2017, 06:21 PM
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#8
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Junior Member
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Join Date: Oct 2016
Location: Bay Area, CA
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Thanks for the comments. Feel free to have them reach out to me directly too if they need further help.
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04-23-2017, 09:49 AM
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#9
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Join Date: Jan 2015
Location: East Mountains, NM
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Quote:
Originally Posted by Slam95d
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What an awesome job, I'm very impressed with your tenacity. I'm having the same problem but for a different reason so I'll start a new thread.
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2003 Sport V8 Icon 2" rear, Bilstein 6112 front with 700# king springs, Gibson cat back, Magnaflow cross pipe. OBA, DIY sliders, etc
1996 FZJ80 landcruiser with whole bunch of stuff, including a Turbo.
1997 4Runner SR5 - daughter's ride, slowly getting built up
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12-16-2019, 01:39 PM
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#10
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Junior Member
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Join Date: Dec 2019
Location: DFW
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Quote:
Originally Posted by sibanez
Did you ever figure out the cause? Just hit this myself.
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I’ve got the P0051 on my 04 4R Ltd V8. I’m not able to actually locate the sensor. I’ve read it is Bank 2 (passenger side) and pre-cat.
Any help is greatly appreciated. I’ve already purchased denso sensor from Napa.
Quintin
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12-16-2019, 05:06 PM
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#11
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Senior Member
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Join Date: Dec 2018
Location: New Hampshire
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Real Name: Mike
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Senior Member
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Quote:
Originally Posted by Quintin
I’ve got the P0051 on my 04 4R Ltd V8. I’m not able to actually locate the sensor. I’ve read it is Bank 2 (passenger side) and pre-cat.
Any help is greatly appreciated. I’ve already purchased denso sensor from Napa.
Quintin
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If it's anything like the V6 you just look at where the manifold bolts to the cylinder from above and just follow the pipe down. Kinda near the firewall.
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03 4runner Limited
1GR-FE V6 w/199k miles
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06-14-2020, 09:57 PM
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#12
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Join Date: May 2017
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Quote:
Originally Posted by Slam95d
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.
Above link doesnt work...figured a way by typing in p0031 on that page & it worked which is pasted below...
P0031 and P0051 Codes - Check Engine Light, VSC TRAC, VSC OFF Light - The Track Ahead
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2008 4Runner Limited 4.7 V8 Limited, XREAS & Rear Air bag, Nautical blue metallic
2005 4Runner Limited - 4.7L V8 Sold
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07-04-2020, 07:06 PM
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#13
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Join Date: Jul 2010
Location: Denver, CO
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So what if I’m getting these codes but also p101 and 102 MAF sensor codes? The 101 and 102 codes come at first start. The o2 sensor ones come after I drive a bit. I replaced the MAF sensor but it could be the wiring harness for the MAF still.
Are these o2 ones just a symptom of the MAF issues or an issue unto themselves?
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2004 Sport Edition V8. 3" OME lift. 5th Gen Brakes. 285/70 Duratracs. JBA UCAs. SCS Ray10s. DT Headers.
1997 4-Runner Limited w/ factory locker. Totaled in February 2018. Still miss it.
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