I had the same problem: Check Engine Light ON, Code: BAD KNOCK SENSOR
I solved the problem by adding 5 cans of "Fuel system cleaner" to my gas tank, during 5 gas fillups.
PROBLEM SOLVED!!!
Cost: About $20.00 (2 cans of GUMOUT were free after the rebates at AutoZone)
After I started having this problem, my 1999 RX300 would not shift into OD. I had to STOP, disconnect the Battery for 10 seconds, and then go.
After reading many posts on the web on the cost to replace the knock sensors (and the transmission) I decided to try ANYTHING! After adding three cans of Fuel system cleaner, the Check engine light quit comming on. I added 2 more anyway. My car has about 120,000 miles and I figured the inside of the engine (where the knock sensors are) is probobly filled with carbon deposits, these carbon deposits might be affecting how the knock sesnors work. Fuel system Cleaners claim to "Remove Carbon deposits inside the engine".
Lesson: If you ever get the Knock Sensor Code: P0330 (I think), FIRST try solving the problem with 4 or 5 cans of FUEL SYSTEM CLEANER. I also noticed that now, my transmission shifts into OD normally when the engine is cold. Before, it would take the car about 5 minutes to warm up enough for the tranny to shift into Overdrive.
TRY IT!!!! And let me know if it worked for you at mijangos1@gmail.com
Good luck,
Adrian Mijangos :)
