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Please help me with the Air Fuel ratio sensor

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Old 02-15-2010, 07:36 AM   #1
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Please help me with the Air Fuel ratio sensor

02 Taco, 4WD, crew cab, auto tranny V6. Hope that narrows it down a bit. My CEL came on a while back. To be sure it wasn't just a loose gas cap, I disconnected the battery and reset it. It did come back, and I've been getting REALLY bad fuel economy. I went from 12-15 to 8-10. With a little over half a tank, I've got about 60 miles on the trip O.D.!

So I took it to Autozone for a free scan. Seems I have a bad air fuel ratio sensor. I called Toyota, $215 just for the part! Knowing there's GOTTA be aftermarket stuff for a truck this old, I tried Autozone. The chick that answered couldn't find it. I think I found it here, but now I'm confused.

http://www.autozone.com/autozone/cat...ll&totalPages=[I@1897725&currentPage=1&vehicleNValue=&navValue=15 900117&parentId=59-0&fromString=&fromWhere=null&filterByKeyWord=&cate goryNValue=&categoryDisplayName=Engine+Management& _requestid=222311

Does it really matter if I have an automatic? If so, how can I be sure this is the problem? I'd hate to sped $170 on a sensor, another $50-$70 getting installed, only to find out it was something else? Any theories, suggestions?
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Old 02-15-2010, 07:41 AM   #2
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http://www.urdusa.com/index.php?cPat...rrpek6cb1u3716

http://www.urdusa.com/product_info.p...rrpek6cb1u3716

2349001 is the Denso sensor you need. It is also $143 at www.rockauto.com

Yes it does matter that it is an auto. It is a simply swap that you can do on your own and pocket the $50-$70 install price.
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Old 02-15-2010, 07:46 AM   #3
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Quote:
Originally Posted by 98tacoma27 View Post
http://www.urdusa.com/index.php?cPat...rrpek6cb1u3716

http://www.urdusa.com/product_info.p...rrpek6cb1u3716

2349001 is the Denso sensor you need. It is also $143 at www.rockauto.com

Yes it does matter that it is an auto. It is a simply swap that you can do on your own and pocket the $50-$70 install price.
Firstly, thank you for the quick response! Thank you for the links too, it's why I came here!

I've helped with O2 sensors on friend's rides. It took a torch, 3 hours and 20 busted knuckles to get the old one out(granted, this was a chevy van). The new one was pretty easy to install. I'm no rookie, but I don't have a shop or garage either. Will I need a torch or an impact tool to get this thing out?
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Old 02-15-2010, 07:48 AM   #4
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A 12mm wrench (IIRC)
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Old 02-15-2010, 08:33 AM   #5
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Alrighty, I plan to tackle this little job myself. I took a look under the hood to see how tricky this will be. On the driver's side, I see a mess of wires, the steering linkage, and some other stuff. I think I can see a sensor, but I'm not sure. On the passenger side I can clearly see something that looks just like whats in all the pics I've been looking at. It also appears to be at the leading edge of the cat. Which side is the bank 1 air fuel ratio sensor 1? Driver or passenger? Forgive me, I don't have a chilton's for this thing yet...
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Old 02-15-2010, 08:38 AM   #6
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http://www.ncttora.com/fsm/2003/Repa.../afrs/comp.pdf
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Old 02-15-2010, 08:39 AM   #7
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The FSM for your truck.

http://www.ncttora.com/fsm/2003/index.html
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Old 02-15-2010, 08:48 AM   #8
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Thank you. It appears to be on the driver's side. Is there a way to confirm it?
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Old 02-15-2010, 08:52 AM   #9
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You only have one AFR so it is the one before your CAT.
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Old 02-15-2010, 09:01 AM   #10
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Cool, thank you!
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Old 02-20-2010, 06:39 AM   #12
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Well, now it seems the sensor is actually ok, it's got a loose wire. When the wire gets bumped just right, it throws a code and the CEL comes on. Reset it, the light goes away, and the fuel economy gets better. It even says intermittent connection when we use a scan tool. So I might be able to just fix the wire(I hope) Otherwise, the cheapest I can get the part for(from a place I'm willing to trust to buy it) is $170, then another $50+ for install(I don't have a lift) Thanks for the help guys.
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Old 02-20-2010, 06:47 AM   #13
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its not on the driverside, its on the passenger side because thats where the exhaust is, the one before the cat is bank 1 sensor 1. one thing to do to avoid the busted knuckles is start hitting the nuts holding the sensor to the flange with some penetrating fluid every day for a couple days before you plan to remove it. worked for me and no busted knuckles. You dont need a lift to do the install, just crawl underneath the truck, its easy to get at.
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Old 02-20-2010, 08:27 AM   #14
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I may try it. Gotta go dig up my liquid wrench. I've been playing with RC cars, so I haven't needed "Real" tools in a while. hehe

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Old 02-20-2010, 04:52 PM   #15
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Thanks for all the advice Guys.. I have an other twist... I bought an Effie module a year ago and haven't installed it yet when i was working on the HHO system for my truck. I can save my self a bunch of cash in replacing O2 sensors... but what I need to find out is where do the wires from the O2 sensors run to? Of course the computer... but I have no clue.. is it under the dash or under the hood? Has anyone had to locate the wires? Is there a schematic that is downloadable for the wiring.. I have to splice in, then with the module I can adjust the voltage coming back from the O2 sensors to lean out the engine. i have 300,000 kms on my truck, the service enging light is on and I'm getting horrible mileage.. 12 to 13 mile per (imp gallon) Ouch.. if anyone has any advice I'd love to hear about it please. Thanks in advance.
Brian
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Old 02-21-2010, 12:36 PM   #16
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http://www.lieblweb.com/o2replacement.html

this is for the 1st gens anyway, not sure about 2nd gens
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