Tired of looking at my check engine light, so im going to put in a new o2 sensor, After i started looking online there are soo many different models and brands for the year of my 4runner (2000) and i honestly have no idea which one to get? My code is showing bank 2 which i assume means the downstream sensor.. any help on the brand or model number to get for my 2000 limited v6 4x4? I just dont understand why some are 89$ and some are $160 bucks ? I think i will also grab a new ohmeter and test the sensors before i shell out the money, since it could be a bad cat, which i sure hope not.

 

I get Bosch at local parts stores for under $100

:wabbit2:

 

Rockauto.com sells denso brand sensors at a reasonable price. Bank refers to which side of the engine. Bank 1 sensor 1 is pass side front. Bank 1 sensor 2 is after cat. What code?

 

There is no way you got a code for Bank 2. Our trucks don't have a Bank 2 for exhaust. I assume you got Bank 1 Sensor 2 (rear O2 sensor). Post the exact code and we can be sure.

It will depend on whether you are Cali. emissions or not. It does not matter if the truck was sold outside Cali., the Cali. emissions were sold all over the country. The safest way is to get under the truck and count cats. Two = Cali. One = Not Cali. Cats are located between the two sensors. Anything not between the sensors is not a cat. If you can't find the sensors, you won't be able to change them so this is a good time to do that. Looking at the label can be misleading--try that at your own risk. Since you are a limited, you are auto, so:

Go here: http://www.densoaftermarket.com/cata....php?part=o2sn

Cali rear auto V6 4wd = Denso 234-4153


Not Cali rear auto V6 4wd = Denso 234-4162


Amazon is usually the cheapest in my experience, but check rockauto, too. Google the part number for lots of options. Don't even think about getting anything but the OEM Denso. Bosch may be cheaper but they cause problems for a lot of people on this motor.

If you have a P0420, the ohm test won't mean much, as the ohm test only verifies the heater. The sensor could be degraded while the heater is still good. If it is not a P0420, there is no reason to suspect the cat.

 

this^

pay once, know it will be correct

getting something else, more often than not leads to wasted money
then eventually you'll be getting OEM

 

I will double check the code once i leave work i think it is the P0420 but will find out. I Knew it was either Denso or Boesch that works best on our trucks but couldnt remember, I will chime back in when i verify that code. Thanks again guys!

 

p0420 is catalyst efficiency below threshold. You'll be wasting money if you buy a sensor. Either an exhaust leak before the rear sensor or a bad cat

 

not always. look at the miles first...best guess is sensor itself is toast

o2 sensors go bad around the same time the a/f sensor
goes bad which is usually 110,000-160,000 miles

most likely 130,000 miles....sensors do not have an infinite life

 

wrong

 

He is not wrong. the sensor's do wear out over time. they effect the way your truck runs, and your mileage, get some new ones at rockauto,, best price, and get OEM's.

 

I never said the sensors don't wear out. I said a bad sensor won't cause a P0420.

 

Go to the Denso site and find which sensor you need. Then check Amazon.com . Most of their Densos are $55-65 compared to $80+ from auto parts sites. The only thing is their "will it fit" software on Amazon is screwed up. You will also need 8 x 1.25 nuts, 2 per sensor. They are cheap from Advance Auto, like $2.99 for 5 compared to nearly $12 from the dealer. Plus my dealer wanted to order them!

 

Jumping in for an Oxygen Sensor installation/fit question.

89 4Runner 22RE, sensor immediately before catalytic. The sensor i ordered has four wires: 2 white, 1 gray, 1 black. It also has a coupler installed in the end. I pulled up the carpet under the driver seat and found what looked like a coupler but was just ran straight through with wires. Is cutting and splicing OK? If i orient my new sensor wires the same as the old sensor wires will I not screw up the 2 white wires. Looks like this:
_____
|W G|
|B W|

So I think as long as I keep each in the right quadrant it should be alright?

 

Don't forget you're on the 3rd Gen forum. I have an 89 22RE too. The PO had just put a new O2 sensor on it so I haven' t messed with it. During my tour of the Denso sight I noticed they sell a Universal Toyota sensor that's about $10 cheaper than the others. It comes with bare wires, no plug and connectors and heat shrink. You are supposed to connect it to your old sensor's plug. So I think you can go ahead and do it. I would take out the old plug though and solder and heat shrink all my connections.

 

Sorry guys, havent been able to find my code reader, everything we own is in a storage unit right now, moving into our new house next week so hopefully find it and chime back in with the exact code.

 

At 115,000 on my '99 California Limited, this past week I have replaced both A/F (upstream) and O2 (downstream) after several codes appeared with a check engine light. Ordered both on Advance Auto.com using their 20% online discount code, got under my truck with a socket wrench and installed both within an hour's time, never having seen it done before. Truck is way peppier and smoother than it's been since I purchased it 3 months ago. A clear difference in performance. The A/F threw the code, but I spent the $170 total to buy both sensors, knowing that the other would go just as soon as I crawled out from under, and wouldn't you know, the downstream sensor was black and more worn than the A/F. Point is, if the check engine code says it's time for one, replace them both/all. You'll be glad you won't have to mess with any of it again for a least another hundo.