2000 Lexus RX 300

Engine Mechanical problem
2000 Lexus RX 300 6 cyl All Wheel Drive Automatic 83,000 miles

mycheck engine light is on and I faield the Illinois emission test, so I paid $1158.00 to a lexus dealer to fix code P0768. Tghe put a new ciomputer in, the light is still and I still failed the re-test. Can you tell me what needs to be repaired. The repair shop at the dealer said they don't know what to do and take it to another mechanic. This is impossible since I have already spent all my money with them.
June 29, 2010.

What you have here is a transmission problem involving a shift solenoid.

Jun 29, 2010.