All (4) O2 sensors replaced. Still have check engine light

surfsupl · 09-01-2011, 07:25 AM

Like the title sais^^^^^^^^^^^^^

Codes P0031 & P0051

I have also checked and its the A/F heater relay and its good.. Any suggestions?

surfsupl · 09-01-2011, 05:35 PM

No one?

HondaGM · 09-01-2011, 05:40 PM

fuses?

Steves104x4 · 09-01-2011, 05:43 PM

I'm sure you did but I'll ask anyway; you disconnected the battery to reset the codes?

Check fuses.

Check the wiring running to the sensors that an animal hasn't eaten your wiring for dinner.

Check for pinched or burned wiring especially around the EGR Valve or anywhere that gets hot.

Check ground wires that connect to frame.

NelsonTacoma · 09-01-2011, 05:55 PM

Quote:

Originally Posted by Steves104x4

Check fuses.

Check the wiring running to the sensors that an animal hasn't eaten your wiring for dinner.

Check for pinched or burned wiring especially around the EGR Valve or anywhere that gets hot.

Check ground wires that connect to frame.

This is exactly what I was going to say. According to my diagnostic flow chart, the only things that can cause these codes are bad wiring, bad o2 sensors, bad relay, or bad pcm. Since you've already replaced the o2 sensors and tested the relay, we know that's not the problem, so I'm guessing at a bad wire somewhere, cause I don't even want to think that it's the pcm. If you need help with the wiring diagrams or connector end diagrams let me know.

surfsupl · 09-02-2011, 11:55 AM

Quote:

Originally Posted by Steves104x4

I'm sure you did but I'll ask anyway; you disconnected the battery to reset the codes?

Check fuses.

Check the wiring running to the sensors that an animal hasn't eaten your wiring for dinner.

Check for pinched or burned wiring especially around the EGR Valve or anywhere that gets hot.

Check ground wires that connect to frame.

Pretty much have done all mentioned above . As far as fuses are their any for these besides the relay?

NelsonTacoma · 09-02-2011, 04:22 PM

Quote:

Originally Posted by surfsupl

Pretty much have done all mentioned above . As far as fuses are their any for these besides the relay?

Have you actually ohm checked all the wires related to the o2 sensor system with a digital multimeter? Just because you inspected the wiring visually does not mean its not messed up somewhere inside that you can't physically see. I'll find a wiring diagram for you and post it up, maybe that can help you diagnose it a little better.

98tacoma27 · 09-02-2011, 04:27 PM

http://ncttora.com/fsm/05+/data/ilea...ta/0050015.pdf

I'd test the relay coil and contacts

NelsonTacoma · 09-02-2011, 04:36 PM

09-01-2011, 07:25 AM	#1
surfsupl [OP] Senior Member Name: Gregg Joined: Jan 2008, #4161 Location: SoCal Gender: Male Posts: 14,293 I DONT CARE IF IT'S A RE-POST Access Cab Automatic V6 Rear Diff Breather~ 5100's ~Fog Light Anytime~Tint~TRD Seat Covers~Weather Tech's~Pioneer H.U.~Lift~	All (4) O2 sensors replaced. Still have check engine light Like the title sais^^^^^^^^^^^^^ Codes P0031 & P0051 I have also checked and its the A/F heater relay and its good.. Any suggestions?

09-01-2011, 05:40 PM	#3
HondaGM Roll Tide Name: James Joined: Oct 2009, #25056 Location: South-Pole Age: 49 Gender: Dude Posts: 5,353 09 DC 4x4 Blown Honda VTEC V8 2009 Double Cab Automatic honda v8 trd exhaust,step bars,vent visors,bed lights,tailgate mod	fuses? __________________

09-01-2011, 05:43 PM	#4
Steves104x4 5th. It's where the magic happens. Name: Steve Joined: Apr 2010, #35468 Location: Buffalo NY Age: 4 Gender: Male Posts: 3,508 2010 Regular cab 2.7 4x4 2010 Regular Cab Manual 2.7 4 cyl BUCKLE UP! It makes it harder for Aliens to pull you out of your Truck.	I'm sure you did but I'll ask anyway; you disconnected the battery to reset the codes? Check fuses. Check the wiring running to the sensors that an animal hasn't eaten your wiring for dinner. Check for pinched or burned wiring especially around the EGR Valve or anywhere that gets hot. Check ground wires that connect to frame. __________________

09-02-2011, 04:36 PM	#9
NelsonTacoma This is my derpawayinator!!!!! Joined: Mar 2010, #33969 Location: Tucson, AZ Age: 32 Gender: Male Posts: 2,007 06 PreRunner TRD Sport & 08 4Runner SR5 4X4 2006 Double Cab Automatic 4.0L V6 2.5 Inch Leveling Kit, 6000k HID Hi/Low Kit, Magnaflow Muffler, Drop in K&N Air Filter, 1.5 inch AP Wheel Spacers, Mudflap Delete	__________________

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09-01-2011, 05:35 PM	#2
surfsupl [OP] Senior Member Name: Gregg Joined: Jan 2008, #4161 Location: SoCal Gender: Male Posts: 14,293 I DONT CARE IF IT'S A RE-POST Access Cab Automatic V6 Rear Diff Breather~ 5100's ~Fog Light Anytime~Tint~TRD Seat Covers~Weather Tech's~Pioneer H.U.~Lift~	No one?

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