Rockauto should have what you need.
Get Denso NOT Bosch!

 

Yes, I know they have the parts but what specific o2 sensor do I need? The HL has a few o2 sensors, and I need to know which one to order.

Zack

 

Well if you drill down on rockauto's site you see there's upstream left and upstream right and a downstream after Cat.

Here is your code.
http://www.obd-codes.com/p0037

 

Ok we'll I'm getting closer to figuring out which one....

So this o2 sensor is after the main cat, but bank 1? And the second sensor back? On the rock site it does not seem to indicate "bank 1 sensor 2"

How many total o2 sensors does the 2006 have?

Thank you,
Zack

 

I'm not positive on the first gen but I think 4 if its a non-california model and 5 if california. Sensor 1 is sometimes called a fuel air sensor, then sensor 2 is called the oxygen sensor. The O2 sensor is after the cat in the exhaust manifold, the fuel air sensor is before it (its the one you can see if you look at the manifold)

This pic will help explain it a bit: (NOTE: The orientation of Sensor 1 and 2 are correct below, BUT bank 1 and bank 2 COULD be different in a toyota, that totally depends on the engineers who designed the engine, so don't use the pic below as bank identification.)

If I recall correctly, the california models have a 5th 02 sensor after the final cat (3rd one) after the y-pipe.

 

bank 2 is front of car(radiator) and bank 1 is back(firewall)

 

Non-California V6's have 3 sensors; two upstream and one down.

I believe CA cars V6's have 4; two upstream, two downstream.

 

do they just skip one of the cats on the V6? Or is the only downstream sensor after the y-pipe?

 

For non-Calif, there is one right at the exit of the manifold for each bank and one after the common cat.

Although I've never put eyes on a Calif HL, from various posts it seems like there is a pair of cats, with sensors before and after them.

 

I appreciate everyone trying to help, but I am still very confused.
On Rockauto here is the HUGE list of possible choices, which one do I need???

BOSCH Part # 15569 OE Type - Exact Fit; Heated; Wires: 4; Length (in): 13.7
Downstream Left
Part Image
* Stocked in outlying warehouse--shipping delayed up to 2 business days
$50.99

DENSO Part # 2344168 OE Style One of our most popular parts
Downstream Left
Part Image
$56.79

DELPHI Part # ES20213
Rear (Downstream) Left; Limited; Sport; Wrench Size: 7/8 in.
Part Image
$67.79

NTK Part # 24677 NTK OE Type
Downstream Left; 4; 5
Part Image
$75.79

DENSO Part # 2344509 OE Style One of our most popular parts
Downstream Right
Part Image
$77.79

DELPHI Part # ES20226
Rear (Downstream) Right; Limited; Sport; Wrench Size: 7/8 in. (Only 4 Remaining)
Part Image
$81.79

NTK Part # 25721 NTK OE Type
Downstream Right; 5 (Only 4 Remaining)
Part Image
$89.99

STANDARD MOTOR PRODUCTS Part # SG1432 {#8946548180}
Downstream Rear
Part Image
$100.79

ACDELCO Part # 2134727 {#88864655} 4 Wire
SENSOR,HTD OXY(POSN 3) *DOWNSTREAM, RR
Part Image
* Stocked in outlying warehouse--shipping delayed up to 5 business days
$100.99

ACDELCO Part # 2133037 {#19107381} 4 Wire
SENSOR,HTD OXY(POSN 3) *DOWNSTREAM, FRT
Part Image
* Stocked in outlying warehouse--shipping delayed up to 1 business day
$101.89

DENSO Part # 2349046
Front Right (Only 1 Remaining)
Part Image
* Stocked in outlying warehouse--shipping delayed up to 1 business day
$103.79

BOSCH Part # 15570 OE Type - Exact Fit; Heated; Wires: 4; Length (in): 25.5
Downstream Right
Part Image
$109.79

STANDARD MOTOR PRODUCTS Part # SG1431 {#8946548170}
Downstream Front
Part Image
$113.79

DENSO Part # 2349042 {#2349043, 2349045, 2349046} OE Style One of our most popular parts
Upstream Right
Upstream Left
Part Image
$115.79

STANDARD MOTOR PRODUCTS Part # SG1433 {Click Info Link for Alternate/OEM Part Numbers}
Upstream Front
Part Image
* Stocked in outlying warehouse--shipping delayed up to 1 business day
$119.79

APWI Part # AP4376
Upstream Front
Upstream Rear (Only 2 Remaining)
Part Image
$127.79

NTK Part # 24827 NTK OE Type Air-Fuel
Upstream Right
Upstream Left (Only 2 Remaining)
Part Image
$137.79

STANDARD MOTOR PRODUCTS Part # SG757 {Click Info Link for Alternate/OEM Part Numbers}
Upstream Rear
Part Image
$159.79

BOSCH Part # 15571 Wideband A/F Sensor - OE Type - Exact Fit; Wideband A/F; Wires: 4; Length (in): 11.8
Upstream Left
Part Image
$172.89

BOSCH Part # 15572 Wideband A/F Sensor - OE Type - Exact Fit; Wideband A/F; Wires: 4; Length (in): 11.3
Upstream Right
Part Image
$277.89

NTK Part # 24686
Post-Cat (Downstream)alyst; Right
- Non-stock item--shipping delayed up to 3 business days


Thank you,
Zack

 

The way I understand it is left means bank 1 or rear, next to firewall, and right means bank 2 or in front, next to radiator. Upstream means sensor 1 and downstream means sensor 2.

 

Usually the back one against the firewall is the first to go. Good luck getting it out, heat cycling has that sensor welded in there.

 

"Heated Oxygen sensors (HO2S) are inputs used by the PCM (Powertrain Control Module) to determine oxygen content in the exhaust system. Bank 1, sensor 2 refers to the second sensor back on bank 1. The PCM uses the information gained from the Bank 1,2 HO2S mainly to monitor the efficiency of the catalytic converter."

Then use the diagram provided by Sweeny.

I would say downstream right from that image

 

Zack1978,

It sounds like some highlanders have three sensors and some have four. It also sounds like the catch is whether the car was destined for California or not. Yours (being in NJ) was mostly not from California which would mean you've got a three sensor version.

Bank One Sensor Two (B1S2) is located below the drivers seat on the underside of the car. Sometimes referred to as the downstream sensor. Stick your head underneath the driver's door and it's easy to see. it's a pain to replace because a) it's probably very rusty, and b) you have to remove the driver's seat to get to the wiring.

But if that's the one you need, then the Denso number is 234-4215.