mm4tt

I forgot to mention, I also just noticed a vacuum hose was disconnected, the 1 that goes into the Air Filter Cover. I reconnected it. Reset the code by unplug battery. This car now has 150,000 miles on it. Radiator is new from toyota as of 2009.

Alright, I borrowed a scanner from autozone, and cleared all the codes, drove it for 2 days and the o2 codes have not come back, THE only code now is P0125, something about coolant flow or something. I have seen the check engine light turn off once while driving, then came back on and stays on. Same code P0125. I popped the hood and saw a FLAT upper radiator hose! I let it cool, took off the cap (which is new) and checked the fluid GREEn and smells fine, it was flushed 2 months ago. Any ideas why it is going flat, just an old hose, or is something else wrong? It just seems like 1 code now i can figure this out at home, really want to avoid taking it somewhere. Thanks.

I just checked the wire harness connected to the Generic o2 sensor itself, i can't reach the one back to the ECM. I've been going to autozone and getting it checked by them. i think as long as i have older used vehicles im going to go buy a scanner right now :)

Thanks for confirming the location. I checked the wire and it looks good i have continuity on them all. Is there a proper or good way to reset this light? I dont want to have the stereo lock up or anything. But the last couple of times i just unplugged the battery for a short time. Does it need a HARD reset?

Hi. This is my first post I've had the car for about 6months and it has been great, but the check engine light keeps coming on and off. Ok so after i bought my 97 es300 a week later it started smoking blue ... iv never had a car do that so i was worried, but i HAD to drive it to my job about a 300mile trip before i got online and figured to check the PCV valve, of course that stopped the smoking immediately. I reset the computer by removing the + terminal on the battery and drove it, light came on again with codes... (P1030 and 0133 .. the usual ones) i bought a new O2 sensor and replaced it on the Firewall side (bank1 sensor 1 right?) so after that it still ran fine i guess light came on, got it scanned again and it kept having "transmission speed sensor code come up".. i replaced the speed sensor today 108.00. :( about 20 minutes of driving later the check engine light came back on .. speed sensor code is gone, now it has (P0125, P0130, P0133) Where should i go from here? I am thinking is the catalytic converter done? or should it be the other O2 sensors. It all seems to be pointing to bank1 sensor1 not even 100% sure where that one is located. Any help or experiences yall have had with this would be good. Thanks. P.S./ the major thing i have noticed it drives great starts right up... but gas mileage went from 420.0 miles per tank to 320.0