O2 Sensor 2004 Land Cruiser Bank 1 Sensor 1 ...

[cwmoser]

I'm confused. What is the part number for O2 Sensor on 2004 Land Cruiser Bank 1 Sensor 1?
On Amazon, I can find a sensor but it states its for the right side - are Sensor 1's different right and left?

 

[JunkCrzr89]

They’re not different between DS and PS, only different between upstream and downstream. The upstream (sensor #1) is Denso 2344138.

 

[cwmoser]

Thanks. Ordered a Denso 2344138 from Amazon for our 2004 LC.
I note that the 2002 LX470 uses a different Denso 2344169 - same Engine.
Confused me. Along with a listing in Amazon that left and right were different.

BTW, any issues in replacing the O2 Sensor? I have an O2 socket.

 

[JunkCrzr89]

I note that the 2002 LX470 uses a different Denso 2344169 - same Engine.
Confused me.

Major changes to the powertrain occurred in 2003 that influence emissions and thus the need for different O2 sensors.

BTW, any issues in replacing the O2 Sensor? I have an O2 socket.

Might be tough to get a socket in there. Boxend wrench or crowsfoot will probably work better. Soak the hell out of it with PB blaster a day ahead of time.

 

[cwmoser]

Got the O2 Sensor loose. How do you remove the electrical connector?

 

[BadReligion]

Got the O2 Sensor loose. How do you remove the electrical connector?

Should come out like most other connectors. Press the tab on one side and then pull. I just did all 4 of my sensors and I remember the front connecters taking a little effort to release.

 

[cwmoser]

Should come out like most other connectors. Press the tab on one side and then pull. I just did all 4 of my sensors and I remember the front connecters taking a little effort to release.

Thanks. I had to unbolt the mounting bolt and then surprise the tab was on the back side where I could not see it.
It took more time dealing with unplugging the electric connector than removing the actual sensor.
I used an O2 tool which made it easy.

 

[BadReligion]

Thanks. I had to unbolt the mounting bolt and then surprise the tab was on the back side where I could not see it.
It took more time dealing with unplugging the electric connector than removing the actual sensor.
I used an O2 tool which made it easy.

I've struggled with more than a few connectors. The O2 sensor socket is well worth it for the $10 or so!

 

[jerryb]

I have no idea why they placed the lock tab against the upper side, aggregating for sure.
the easy thing is releasing the metal tab with the dimple on it on the bracket that faces the floor with a small flat head, and then puling off the connector and turning it over to see the lock release tab.

 

[MountaineerLC]

Thanks. Ordered a Denso 2344138 from Amazon for our 2004 LC.
I note that the 2002 LX470 uses a different Denso 2344169 - same Engine.
Confused me. Along with a listing in Amazon that left and right were different.

BTW, any issues in replacing the O2 Sensor? I have an O2 socket.

Nope, it's very straight toward. I used an O2 socket.

 

[cwmoser]

O2 Sensor #1 for 2004 Land Cruiser: Denso 2344138
O2 Sensor #1 for 2002 LX470: Denso 2344169

Trouble Codes:
P031 = malfunction sensor on Left side
P0155 = malfunction sensor on Right side

I've got both a 2002 LX470 and a 2004 LC. So far I've had to replace the right side sensor on the LX470 (P0155), and now the left side sensor on the LC (P031). I find my ELM327 and Torque smartphone app invaluable.

Anybody contemplating doing this for the first time, if you are skinny like me you can do the job without a jack.
You'll need these tools:

• 12mm socket
• O2 Sensor tool (Harbor Freight sells them - get one like in photo)
• 3/8" ratchet
• Flashlight
• ELM327 ODB2 device
• Torque App on your Android smartphone

Crawl under your LC and drop just the left side of the plastic shield using 12mm socket and 3/8" ratchet.
The plastic shield is attached using x4 12mm bolts - 2 in front, 2 in rear, just remove the 2 rear bolts - left side and right side.
Position flashlight so you can see.
Press the back side tab on the Electrical connector and pull the O2 connector from the socket.
Use O2 sensor tool and 3/8" ratchet and remove O2 sensor.

Apply Copper Seize only on threads of new O2 Sensor.
A small tube of Copper Seize is supplied with the Denso part.
Hand screw the new O2 Sensor into the hole.
Tighten O2 Sensor using O2 Sensor tool.
Plug in the Electrical Cable.

Reinstall the plastic shield using 12mm socket and 3/8" ratchet.

Finally, plug in the ELM327 OBD2 device into the ODB2 connector and use the Torque App on your Android phone to clear Check Codes and turn off warning lights.

 

[JHebert]

Thank you for description of job above. I just ordered parts and going to do on my '04 this weekend.

Quick question. I don't have an Android or the Touque app. Will code clear on it's own once new sensor is in or do I need to find a way to connect to clear and turn off engine light?