1999 Lexus ES 300 6 cyl Front Wheel Drive Automatic 135000 miles
Computer Sensor code from Auto Zone is: PO325
Probable causes listed are:
001. Open or short circuit condition
002. Poor electrical connection
003. Faulty KS
The Auto Zone clerk said the KS was a Knock Sensor.
The car usually shifts from low to high without a problem starting from a cold start, but after it warms-up it does not want to shift to the highest gear.
Under normal conditions, at 55 mph and the car is in third or the highest gear, the tach is at 2k, but when it does not reach the highest gear the tach is above 3k at 55 mph.
The Check Engine and Trac Off lights have been intermittent, but are on more often than not.
My friend, who worked for his dad in a garage when he was in college doesn't think it's the transmission and he thinks it running fine. He said he doesn't think it's a serious problem. However, I'm not so sure.
We checked the transmission level when it was warm and it was not up to the hot level. Not sure if it should be? The owner's manual gives no information about proper transmission fluid level or how to check it. Had to go online to find the answer. The fluid is not bright red. I changed it last August, then pulled a trailer from Ohio to Georgia in March. The check engine light came on about two weeks ago.
The first time it happened I pulled over to read the owner's manual and when I started the car again, it shifted fine. But after two stops, it would stop short of shifting to the highest gear at 55 mph. Most times when I stop and turn the car off for 20 seconds the problem goes away again until I stop or slow down twice.
I'm planning to change the transmission fluid tomorrow (6/09/09). One of my questions or concerns is how or if the shifting is related to check engine light. I probably should mention that I accidently ran over a five lb. Hammer on the freeway about five hours before the first check engine light and trac off lights appeared together. Not sure if that's a coincidence or possibly related. I wasn't able to avoid the hammer on the freeway because it happened in tight, heavy, rush hour traffic.
Monday, June 8th, 2009 AT 7:14 PM