Lc200 o2 sensor replacement - anybody have instructions?

[TeCKis300]

Here are the 2009 LX570 Oxygen sensor Lexus/Toyota part numbers. You want two of 89467B (front), and 89465A is right rear, 89465 is left rear.

Number	Name	Code
8946560370 / denso 234-4260 (Left rear)	SENSOR, OXYGEN	89465
8946536040 / denso 234-4169 (right rear)	SENSOR, OXYGEN NO.2	89465A
8946735110 / Denso 234-9026 - Qty 2	SENSOR, AIR FUEL RATIO	89467B

Looks like I missed @Znarf post above, but I can confirm I independently came to the same conclusion.

That Hitachi MAF is Hitachi MAF-0103

Thanks for the Denso cross reference. Just did mine today as preventative maintenance at 192k miles.

Probably one of the easier cars I've done. Only need a long handle 22mm wrench. Front passenger had more limited swing but lowering the corner of the factory skid did the trick. And transfer the clip for the right rear O2.

Left front

Right front

Left rear

Right rear

 

[dubaicruiser]

Just did mine today as preventative maintenance at 192k miles.

Will wait for your feedback on any possible fuel consumption changes.

 

[gasman4u]

Di

Thanks for the Denso cross reference. Just did mine today as preventative maintenance at 192k miles.

Probably one of the easier cars I've done. Only need a long handle 22mm wrench. Front passenger had more limited swing but lowering the corner of the factory skid did the trick. And transfer the clip for the right rear O2.

Left front
View attachment 4138393

Right front
View attachment 4138395

Left rear
View attachment 4138392

Right rear
View attachment 4138394

did you change your MAF sensor too?

 

[linuxgod]

Will wait for your feedback on any possible fuel consumption changes.

Had one go bad last summer and swapped both sides. Might’ve helped very slightly at how long the truck thinks it takes to warm up and improved winter cold start mileage slightly but overall zero difference on MPG

 

[TeCKis300]

Will wait for your feedback on any possible fuel consumption changes.

Will do! I don't expect much of anything as the cars been running great. The goal was to ensure that was the case, for trips, but before any significant degradation causes it to affect performance, fuel economy, or resulting stress on the drivetrain. Particularly the catalytic converters as they can be burned up prematurely when closed loop fueling goes bad.

Di

did you change your MAF sensor too?

Nope, I don't intend to proactively unless there's something indicating an issue. The MAF may read airflow and map for fuel, but it is the O2 sensors that are the final component to ensure proper fueling with closed loop feedback.

 

[GrouchyTech]

Thanks for the Denso cross reference. Just did mine today as preventative maintenance at 192k miles.

Probably one of the easier cars I've done. Only need a long handle 22mm wrench. Front passenger had more limited swing but lowering the corner of the factory skid did the trick. And transfer the clip for the right rear O2.

Left front
View attachment 4138393

(Did you clean the anti-seize off that bank 2 A/F sensor before installing)

 

[TeCKis300]

(Did you clean the anti-seize off that bank 2 A/F sensor before installing)

Good catch. I did not even notice. Is there a concern of it burning off and/or contaminating?

Interestingly, the primary sensors came with anti-seize already on the threads. The secondary/rear sets did not. Rust isn't much of an issue in SoCal so honestly I have never paid attention to anti-seize.

 

[GrouchyTech]

Good catch. I did not even notice. Is there a concern of it burning off and/or contaminating?

Interestingly, the primary sensors came with anti-seize already on the threads. The secondary/rear sets did not. Rust isn't much of an issue in SoCal so honestly I have never paid attention to anti-seize.

It’s a ceramic-based anti-seize paste and it can/will “poison” the sensor. It would be a really good idea to remove that sensor and wipe it off carefully with a clean paper towel, then wipe again with a new clean paper towel, then reinstall it. Don’t use anything else to clean it (no solvents, etc).

 

[TeCKis300]

It’s a ceramic-based anti-seize paste and it can/will “poison” the sensor. It would be a really good idea to remove that sensor and wipe it off carefully with a clean paper towel, then wipe again with a new clean paper towel, then reinstall it. Don’t use anything else to clean it (no solvents, etc).

Appreciate the insight. Never knew. Will need to try and get that done before a trip this weekend.

 

[GrouchyTech]

Appreciate the insight. Never knew. Will need to try and get that done before a trip this weekend.

Those things aren’t cheap

 

[gasman4u]

It’s a ceramic-based anti-seize paste and it can/will “poison” the sensor. It would be a really good idea to remove that sensor and wipe it off carefully with a clean paper towel, then wipe again with a new clean paper towel, then reinstall it. Don’t use anything else to clean it (no solvents, etc).

To confirm: you’re saying Toyota pre-applies anti seize that will cause damage to the o2 sensor functionality?

 

[GrouchyTech]

To confirm: you’re saying Toyota pre-applies anti seize that will cause damage to the o2 sensor functionality?

It is applied only to the threads, and there is a plastic cap over those threads. If you don’t pull it off “correctly” some of it can get on the tip/protective tube.

 

[gasman4u]

It is applied only to the threads, and there is a plastic cap over those threads. If you don’t pull it off “correctly” some of it can get on the tip/protective tube.

Makes sense.

“Don’t mess with the sensor!”