Problem Reports
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1999 Toyota Avalon Problems
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 Failed Oxygen Sensor
The Check Engine Light may illuminate because a component of the oxygen sensor stops working. As a result the engine computer is unable to determine the proper ratio of air to fuel for the engine. Replacing the failed oxygen 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.
Excess Engine Oil Consumption
Sludge can build up in the engine because Toyota 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.
Check Engine Light Due to Failed EVAP Purge Control Valve
Intermittent failure of a purge control valve in the evaporative emission system can cause the Check Engine Light to illuminate. A failed valve should be replaced to correct this problem.
Toyota Recall For Steering Shaft Issue
Toyota issued a recall on one of the connections in the steering shaft that was not welded properly, which could cause steering problems. This can be repaired free of charge at a Toyota dealership. The recall applies to only certain 2005 models only.
Oil Leak From the Valve Cover Gaskets
The 6 cylinder engines have a tendency to leak oil from the valve cover gaskets, especially the one near the firewall.
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