Took RX300 to a test-only station (at 1756 Houret court near Montague express) for smog test, waited for 40 minutes before my turn and another 20 minutes for the test and got a fail result. All the usually actual emission tests pass except the one that says Mil/Check Engine light related item. Drove across Montague Express to "捷誠" and got a quote for $200 to fix it, but since they do'nt have a spare car for me to drive home, I'll have to come tomorrow. After contemplating it, I decided to check the Internet for clues on the issue, there was one article that has detailed instructions and photos on how to clean MAF (Mass Air Flow) sensor - possibly the cause for the problem, fairly simple - disconnect the electrical wire connector, unscrew two screws and remove the sensor. Went to Fry's and got a can of "Pure/99% Isopropyl Alcohol" spray to clean the sensor. RX300 does not have the "Check Engine" light when I drove to Frys as I did another power reset before hand - this at least will temporarily remove the light. I disconnect the car battery again before took out the sensor and cleaned it. Reinsert the sensor and reconnect the battery, starting up the engine OK, after taking it out for a test drive (about 30 miles), it is, for the moment, ready to go back for re-test.
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