o2 sensor - '06 Tacoma 4.0L

Put diagnostic on truck because getting CEL. Reading is Bank 2 sensor 2 (downstream). Double checked code at Auto Zone with their diagnostic. Same code. Searched part needed using VIN#. Part number identified. From what I can tell Bank 2 is driver side because cylinder 2 is driver side. So, I need the post cat sensor for Bank 2. Part # is

$49 Denso 234-4260 Oxygen Sensor

Denso 234-4260 or

$48 234-4261 Oxygen Sensor with 4-Wire 10” Harness for Lexus/Toyota V-6 Downstream Left/Front

234-4261.

Here is the problem. When you go to buy one it says Downstream Right or Downstream Left. I have looked everywhere to see whether "Downstream Right" means as you are sitting in vehicle or looking at vehicle from front.

???

 

Rockauto is where I got my o2 sensors. Go back with denso brand. Down stream is away from engine. The upstream sensors are AFR sensors while the downstream is o2. I'd replace both if it was me if you have the extra cash. The left is driver side.

 

Upstream and Downstream are commonly used to indicate what side of the converter the sensor is located. These trucks use A/F Sensor (upstream) and O2 Sensors (Downstream).
It would be easier if they would be listed like this on retail sites.
A lot of folks don’t know the difference, or just call then O2 sensors anyways.
which they “kind of are” but the A/F monitors a wider range of data.

 

Standing in front of truck with hood open, Bank 2 sensor 2 is the driver's side sensor after the cat. (bank 2 refers to the bank that includes cylinder # 2, which is the cylinder closest to you on driver's side. Bank 1 is closest to you passenger side)

 

I would plan on replacing both sensors. If one has failed, the other may not be much longer.

Also, your under the truck doing the work. It only takes a little more time.

 

The O2 sensors are cheap. The A\F one are much more expensive. I changed both of mine out many years ago when replacing my headers with DT Long tube ones.

 

Thank you all. When I ran the VIN # to get the Denso part # it comes back as

$49 234-4260 Oxygen Sensor

234-4260 and

$48 234-4261 Oxygen Sensor with 4-Wire 10” Harness for Lexus/Toyota V-6 Downstream Left/Front

234-4261 for each different side downstream. So, I checked for these part #'s on Amazon and it says they are not a compatible fit. I'm more inclined to trust Denso than Amazon. I might as well do both downstream. The only difference is length of cable on each side.

Debating whether to do upstream AFR sensors. These suckers are expensive.

I'm going to change out the MAF while I'm at it. That's about a 2 minute job.

Hoping downstream will come off easily if I soak with PB blaster overnight. Kid at Auto Zone was clueless as to which special slotted socket I should use. I think its 3/8 drive with 7/8 socket size but not sure.

Thx for all the help.

 

When I did all my sensors about 2-3 years ago, it was around 350 for all 4.