Problem Reports
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1999 Lexus RX300 Problems
Check Engine Light Due to Failed O2 Sensor
The Check Engine Light may come on because a component of the oxygen sensor stops working. Replacement of the failed sensor should correct this concern.
Low Engine Idle and/or Stalling Due to Dirty Idle Air Control Valve
Debris can get into the idle air control valve. This will restrict the air flow into the engine, causing idle speed and/or stalling when cold. The valve can be cleaned or replaced to correct this concern.
Check Engine Light and Lack of Power Due to Failed Mass Air Flow Sensor
The Check Engine Light may illuminate because the mass air flow sensor sends incorrect information to the engine control computer. This can cause a loss of power on acceleration. A failed mass air flow sensor will require replacement.
Misfire and/or Check Engine Light Due to Failed Ignition Coil
On higher mileage vehicles, an engine misfire may develop and/or the Check Engine Light may illuminate due to a failed ignition coil. It is not uncommon to replace all the coils when the first one fails in order to prevent return trips to the repair shop.
Check Engine Light Due to Faulty Pruge Solenoid
Intermittent failure of the purge control valve in the evaporative emissions (EVAP) system may cause the Check Engine Light light to illuminate.
Excess Engine Oil Consumption
Sludge can build up in the engine because Lexus did not recommend frequent enough oil changes. Lexus will sometimes offer a discount on cleaning the engine if necessary. Owners who changed their oil every 3,000 miles did not experience these problems. This sludge build up can lead to excessive oil consumption.
Front Suspension Noise Due to Failed Support Bushing
The front suspension might make noise when going over bumps or rough roads. The support bushing for the suspension commonly needs to be replaced to correct this concern.
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