Toyota Avalon Problem Reports

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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.

 

At higher mileages, (125,000-150,000) the automatic transmission may not shift correctly. This can be caused by the throttle position sensor being out of adjustment or a shift solenoid needing to be replaced. Typically the transmission does not need to be completely overhauled.

An engine oil leak may develop from one or both valve cover gaskets, especially the one near the firewall.

The Throttle Position Sensor can get out of adjustment due to wear in the throttle body or due to carbon build up. This will cause the idle timing to advance more than 30 degrees which will cause very high HC and NOx emissions. Conversely, the Throttle Position Sensors can wear out and not properly advance the timing which causes a lack of power and poor fuel economy.

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.

The 6 cylinder engines have a tendency to leak oil from the valve cover gaskets, especially the one near the firewall.

The idle air control motors tend to become carboned up at around 100,000 miles and will cause a start and stall and/or stalling at stop sign problems. Many times these valves can be cleaned, however, the sure bet is to replace the idle air control motor and clean the throttle body.

The rear Oxygen sensors are a critical element in fuel control (unlike other vehicles) and can cause an emissions test failure for high CO and HCs. The sensing element cracks and and reports an erroneous steady state lean condition which confuses the computer, which in turn makes the fuel mixture overly rich.

A code P0770 or P0773 may occur at higher mileages which indicates that the 3-way lock-up solenoid is defective and will need replacement.
It is important to regularly check the valve clearance as the exhaust valves may become too tight. This will lead to valve failures which are expensive to repair.
By the time the EGR system is plugged, the Oxygen Sensor is getting slow or 'lazy'. When servicing or cleaning  the EGR system, it is a good idea to replace the Oxygen sensor because it works in tandem with the EGR system.