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.
Problems for specific Toyota Avalon years:
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Most reported 2006 Toyota Avalon problems
The Evaporative system may have problems with the vapor canister releasing charcoal pellets that plug the vent valve. Typically a Code P0441, P0442 and P0446 will be set. The key code is the P0446 which is a vent valve electrical failure. The proper repair is to replace the entire canister with all the valves as a unit. This is located on top of the fuel tank and is expensive. Our Technicians tell us that for awhile Toyota was covering these problems, but this may have changed. It would not hurt to call the dealer if this problem occurs to see if Toyota is still helping with these repairs.
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.
well her we are 3 times the charm,. I OWN ONLY TOYOTAS AND THEY HAVE BEEN GREAT WITH THE EXCEPTION OF THE MONEY PIT 2007 AVALON. This all started in 2008, 1 year after its birth, a coil went bad,$400 repair. lets go and move to 2011 more coils fail and it also costs about $300,now we move to 3 years to the date and 5 of 6 cylinders need replacing at the tune of $800.Question why hasn't Toyota admitted to wrong doing and recalled these sh!t car...
When I put my avalon in reverse, there was a loud grinding noise in rear of car.