20 Most Recent 1999 Lexus RX 300 - Page 9 Questions & Answers

Hi Derrick, Have look at the rubberized plastic intake manifold ducting. between the throttle body and the air flow sensor. These ducts break and let in un metered air and cause a lack of power and and even misfiring. If it's broken underneath and difficult to detect or see it may have gone unnoticed. A leakage of air from there can cause the fault readings recorded during a scan. Regards John

Chack the break light switch which on my car is on the break tank. There should be 2 wires going to the switch. If you short them out and the lights work then replace break light switch. It might be the earth connection to break lights. If there is an earth lead remove clean and replace.Then give the connection a coat of paint.

When the beeping noise comes on does the picture of a guy in a seat belt show?That can be a seat belt warning,unless it somehow shorted with the speedometer

DTC P0300 is a random misfire code, Now you mention evap system yes a evap an cause a random misfire if the system purges at idle this can happen if the purge solenoid get stuck in the open position

If the belt drive to the A/C compressor is OK, and the clutch on the compressor is OK (you can see that engage when someone inside the car turns on the A/C), then it is possible your A/C system needs a regas.http://www.wikihow.com/Fix-Your-Car's-Air-Conditioner

have a tester handy.unplug the light and then turn on the headlights.with tester on 12 volts test plug to see if you have 12 volts. if not the plug is properly corroded or shorted .

had the same problem. Took to dealership and had it checked. They told me that the fog lamp and low beam lights had been swapped. Each socket and bulb in the others location.