Yes I wish i had done a little research on the Mass Airflow Sensor... I'm sure my "old" one is good if i had learned about cleaning it. Very easy to get to also. My "knock" was resolved by the MAF change out. So I'm wondering if these Knock Sensors really are bad or not. The dealer said it was an "open" circuit for the knock sensor. They seemed to think is was a wiring issue. My RX300 runs good, but has the downshift problem and doesn't easily go into the last gear, so has high revs if try and go over 55-60 mph. I hate to have the knock sensors replaced if they really aren't bad. I only had 48k on my lexus, but was over 4 years, so they wouldn't cover it under warranty. :(
Is there anyone who can help me with the location of the wiring for the knock sensors?