Gayatri8686

I have a 99 RX300 with 161,000 miles. I am the second owner. I bought it in 2004 on e-bay for $15,900 . It had about 84,000 miles at that time. I live at over 2000 ft elevation on a dusty washboard dirt road at the end of 20 miles of windy mountain roads. I repaired the timing belt at 110,000. and front Macpherson struts at 120,000. At 134,000 I fried the transmission hauling a trailer of building material weekly from the nearest Home Depot, (a 2 hour drive... 1 hour on dirt roads up to 4000 ft elevation ) for 7 months while building a 3000 Sq Ft building. I regretted not buying the extended warranty when the Aamco rebuild went 11,000 miles and 13 months later. Now I am on my second AAmco rebuild...this one with a 3 year warranty. I plan to replace the knock sensors next week as this tranny is not shifting into overdrive. In attempting to diagnose the problem we got code 0171 SKS Lean and Code 0330 Knock Sensor 2. I am also having a problem that when you put the pedal to the metal...the engine hesitates for an endless 10 to 20 seconds before revving up. I hope this repair will knock some sense into my cars computer. I have been pouring fuel system cleaners into the RX for 2 weeks hoping for a miracle & I did a 3M Fuel System Tune Up today. It was a snap! But cleaning the throttle body etc. didn't address my problems. I have some MAS (Mass Air Sensor) cleaner coming...perhaps that will be successful. Any advice on solving my problems while avoiding the $500 to $700 that the knock sensor replacement will cost will be appreciated. Its great to have the experience and knowledge of other Lexus owners.