hi CL
my 2000 gs300 has 93k miles, the check engine light come on month ago, i was reset it. then last week the CEL come on again. i got the code P0441 and P0446. so i go the the shop they changed 2 O2 senser for me and reset the CEL. when i drive about 20 miles the CEL come on again. i reset it and it comes on again about 20 to 25 miles.
please CLs can some one tell me what's wrong with my gs300!!

 

Run the codes again.. If the O2's didn't fix it then i'd go back to the same shop and tell them to run the codes again and see if they can find anything else that might be causing it.

 

i will go back there check it out. thanks

 

The same thing happen to me awhile ago and it was the catalytic converter that was bad

 

Both those codes are evaporative emmisions codes. O2 sensors don't have anything to do with it. Check your gas cap first. If its loose, there ya go. If the seal is dried out and not sealing properly that can do it too. Otherwise it could be a vsv thats died or a disconnected hose or tear in one of the hoses in that system.

 

I changed a new gas cap, but the CEL still on >_<

 

When did you do it? The monitors for the evap test take a while to complete. You'd either need to clear the codes and see if it comes back on, or wait a real long time. The ECM will turn off the light if it passes "x" amount of times in a row. I don't remember what that magic number is, but it would take weeks if not months to do.

 

hmmmm, your shop changed out 2 O2 sensors because of these 2 codes, P0441 and
P0446? go back there and ask them why!

 

i am having issues with p0446 as well!! what a pain!

i've gone to two shops to fix this issue so far. i just went to the second one today. the first one had no idea what they were doing and just started replacing parts hoping to fix the problem... biggest bunch of idiots ever. hopefully this second shop fixes it. they found two cracked vacuum lines today and replaced them..