Check Engine Light On

[boblee]

Mechanican changed the oxygen sensor (bank 1, sensor 2) for my 96 es300 two days ago, then I drove about 300 highway miles. when I reached my town, the light was on again.

I went to autozone, the error code is 141. That means the new oxygen sensor has problem again.

It is almost impossible, coz that one bought from the toyota dealer, wouldnot broke in one day.

I am not sure whether there are other reasons to make the my checking light on.

I went to firestone, they asked for $80 for using their computer to scan and get error codes.

What will it cost normally if I want to fix this problem? I want to change that sensor by myself, but I really doubt that is not the sensor problem coz it is brand new sensor.

Any ideas?

[Lex3486]

Well, my first idea, no offense, would be to proofread your post next time, b/c parts of it confused me. Anyhow, I know that there is more than one oxygen sensor on these cars, so I'd suggest maybe replacing them one by one, not including the one you just did of course, and seeing how that works for ya. Other than that, my "shadetree mechanic" mind can't think of anything else to offer! B) Maybe SK can help; he seems to know these cars pretty well.

[boblee]

thanks, lexus3486.

Autozone scaned my car, told me that my car bank1sensor2 has problem( the one I just got changed).

There are 3 oxygen sensors. if the other two broke, it also should be detected by the scanner. but autozone just found the b1s2 has heat circuit problem.

SO you thought the problem might be caused by other two oxygen sensors.

[SKperformance]

i have to agree it is a bit hard to understand what you are saying

but then again i make little sense without a decoder

after treading this post it makes a bit more sense

i might say it is the cat

does it burn oil

or smoke

take it to lexus

as they can evaluate it right and once

don't have to get the work done there just pay for the estimate

[steviej]

if you got the new O2 sensor from Autozone, or if the new sensor is not OEM then it may be tripping your CEL also. I have heard that sometimes this can happen.

So I ask you, is the new O2 sensor a Toyota/Lexus labeled part?

sj

[boblee]

if you got the new O2 sensor from Autozone, or if the new sensor is not OEM then it may be tripping your CEL also. I have heard that sometimes this can happen.

So I ask you, is the new O2 sensor a Toyota/Lexus labeled part?

sj

Yes, the new O2 sensor is toyota OEM product.

[steviej]

then I repeat what sk said......take it to Lexus and see what they find.

sj

[boblee]

Just went to local toyota dealer. I told them the detail of my problem. They called me after two hours and told me car was ready. They charged me $80 for clear the code and told me my O2 sensor is ok. When I drove two miles, check engine light was back. Have to drive my car back and see what they will tell me tommorrow. Hope they can do a little serious check this time.

[boblee]

I told toyota dealer that my cat converter may cause the check engine light on as one suggested here, the mechanician told me there is speically error code for it if it doesnot work. My friend also told me the computer scanner not always correct.

[SKperformance]

the scanner is always correct

but it is not an exact science

the codes are given when a sensor reading is abnormal

it is up to the tech to decide why it is like that

is it a defective wire the engine burning oil

there are many factors

it is not as simple as pluging the scanner in and getting a code and just pulling that sensor out to replace it

as many people assume

only a mechanic would do that

a technition knows more and uses it