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Its a common problem with the AD series engines 1ad ftv, 2ad ftv and 2ad fhv (these being 1ad(2.0) 2ad(2.2) . Build date Avensis april 2005 to feb 2009 rav4 july 2005 to december 2008 auris september 2006 to september 2009 and verso april 2005 to november 2008. I've had a new engine 7k ago due to erratic tick over turned out the engine was consuming oil and causing the egr valve to clog up, also the car was in continual regeneration mode. The under cover warranty is for cars aged to 7 years old or 111846 miles with service history. The conditions covered 1. oil consumption worse than 0.5 litres per 621 miles. 2. over heating and head gasket failure due to carbon deposits on the pistons. Toyota also for other out of warranty claims regarding the ad series engines would accept the following as being linked to a oil consumtion issue due to carbon clogging, egr valve, dpnr, 5th injector, egr cooler, blocked manifold. I managed to come across this information from a toyota warranty bulletin. Hope this helps all owners who's car is fitted with a AD series engine.