guys, i'm wondering how much a Lexus Oxygen sensor costs? for a 1991 LS400 model?looks like mine is bad.

 

Alexander Graham Bell died for nothing!!!

 

Which one? I believe that first Gen LS has four.

 

i'm not sure to be honest (i'm getting it checked out by my mechanic in a few days, he will tell me which one). What's the difference in cost anyways? between a cheap and the most expensive one?

 

Also, doesn't replacing them add horsepower or engine responsiveness? I read something like that in a magazine. Is it true, or advertising?

 

The front two will set you back ~$125 each, the rear two ~$250 each. This price was from Carson Toyota

 

Are they hard to replace? Where are they? Any pictures of prior posts for this topic?

 

It's been a few years ago, probably three, my rear 4-wire sensor was around $125. That was for a 1992. I ordered it through Irontoad.com. I would also try Sewell Lexus - they're on the net.

The onboard diagnostic system will tell you which one is bad.

 

Buy a universal one and do the splicing yourself. Its a piece of cake. runs about 50 bucks a sensor and it works great. I used these:

http://oxygensensors.com

great store and free shipping

as far as adding horsepower. I dont know about that for the Lexus. If your check engine is on and its warning about a bad O2 sensor, then your car will run in a safe mode cutting max power. Once you install fresh o2 sensors, then your car should run to its full potential. I wouldnt say add horsepower, but "regain" horsepower lost.

 

its cake to replace