keram69

Hi, to all.... I have 2000 - RX300 - with the following Trouble Codes...
P0125, 0172,0300, 0301, 0303, 0305, P1130, P1135. ... I want to do this my self...
Can some pls. provide some guidance in this O2 replacement, maybe Diagram..
I was told that is the one from the back of the engine, by the fire wall... is this correct.
Someone alsa mentioned about special key to take this sensor out.
Thanks for your help...

Keram

koolaidman

P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
P0172 System too Rich (Bank 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected

what kind of car and what year. and what has been done to it recently

keram69

This is the Lexus RX300 - 2000 / The car has 74K, there was nothing done to the car... there was a 60K service done last year, but I can't remember anything else. Now, the car will shift from 3rd to 4th
(40-55mph), and the new light comes on TRAC OFF...... Do you know if that is due to the first problem...
or the computer gets ctrazy.... Thanks for your input....

Keram

koolaidman

right now sounds like a hickup. try erasing the codes and see if they come back up. other wise sounds like ur computer is taking a dump

rxdriver

Looking at an RX330 manual (don't have a 300), the one thing all of those codes have in common as a possible cause is the coolant temp sensor. Does the temperature gauge seem to be working OK?

If you discard the P0125 code (coolant temp), then the possibilities also include the mass air flow (MAF) sensor , fuel injector blockage, or a fuel pressure problem.

The MAF sensor is a common source of issues on Toyota engines. It has been discussed on the forum a lot, and fortunately, you can usually clean it rather than replacing it. Search the forum for "MAF" for more details.

A dirty fuel filter might cause the fuel pressure problem. Has it ever been changed? If not, that's something else to consider.

koolaidman

u prolly need to change the coolant temp sensor. if u can get a hold of a scanner tell me what the temp sensor is reading. if not grab a thermonter(sp?) and stick it in the coolant where the radiator cap. make sure the car is not too hot. then if u have a volt ohm meter measure the resistance of the temp sensor. then post back with the info.
if u can pull out the maf and look into it where the hot wire is. tell me if there is a build up of junk on it. or if u can tell me what the maf is reading in cl. either way look at the maff and tell me if there is a build up on the wire