I replaced the Oxygen sensor on my 2003 RX300 and after resetting the code and driving the car for more than 100 miles took my car to inspect and it did not pass the test due to the codes not resetting.
The codes are supposed to reset after driving the cat for 50-70 miles.

Can anyone tell me what could be wrong before I take the car to the Lexus dealer and pay $165.00 for a diagnostic?

Thanks.

 

 

I actually had to drive it for 4 days, 30-35 miles/day before all my monitors ran. (i had a scanner and was able to check my monitors)
I think they needed to see at least 3 monitors running.

I suggest drive it more for a couple of days then have it tested.

 

After reset, the reader shows "not ready",

It would take driving at high speed (not breaking any speed limit) so that torque convertor locks up.
It also meeds number of starts and shutoff.
The engine temp must rise to operating temperature to be recognized as a run.

Typically you can get there in a week of normal driving.

Salim

 

The number of necessary on/off cycles and miles driven is highly variable from one car to another and probably from one code to another.

 

barbaro1,

check this post for how to reset the evap readiness for our RX300's. I used it to reset my readiness after triggering codes and then fixing the issue.
https://www.clublexus.com/forums/rx-...ml#post9634877

It is method #6 in the attachment. Actually doesn't require any driving. You should have an OBD2 reader that can tell you if you are ready.

I use a bluetooth reader like this and the torque app on my android. There are similar apps for iphone.