Five problems related to gas recirculation valve (egr valve) have been reported for the 2012 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Toyota Prius based on all problems reported for the 2012 Prius.
Had blown gasket repair last year (which was fixed by my local Toyota dealership and all cost paid for by myself). Dealership acknowledged that there were known issues with failures due to clogged egr's and out-dated manifolds. Was never recalled and did not know about the issue until after the incident. Wanted to report issues since it appears countless other have been in the same situation with gen 3 Prius. Toyota needs to be offering egr cleanings and updated manifolds at no cost and reimbursing customer's for previous repairs.
Engine -engine have broken head gasket. Coolant reservoir started to drain. Coolant slowly leaks in internal combustion engine due to broken head gasket. Causing shaking engine because coolant cannot combust inside the engine. -also egr cooler was fully clogged by carbon that caused failure of carbon air circulation. Brake slowly failing brake actuator in the process. When pressing brakes, whining sound is present and brakes slowly fails to hold pressure in the system when brakes are applied. -brake system was fully inspected and no leaks were found and brake fluid holds in full level.
1)intermittent regen braking failure causing brakes to become more difficult to press thus harder to stop the car in a timely manner. Usually when there is stop and go driving will the regenerative braking fail. 2) clogged egr valve causing a loud engine knock resulting in a blown head gasket.
Typically the key is left in the car in the garage. Tonight at 6 pm, at a garage temperature of 83 degrees f, the engine spontaneously started. No one was in the car and it had been garaged for about 3 hours. I just happened to be in the garage when the Prius started and was nothing short of flabbergasted.
Engine oil getting to the intake manifold. And filling up with oil. Throttle body gets really dirty with oil. In turn the engine burns oil. Which clogs up the egr system. The engine would over heat which could cause the head gasket to blow. During winter months. Engine restarts would be harsh because it would have condesaion on the cyclinder this could cause the engine to blow. Broken connecting rods. Blown head gasket all sort of things could happen from having oil get to the intake manifold. Starting from 2010 these Prius suffer from this and Toyota hasnt done anything other then suppsodelly redesigning the intake manifold. Which is the same. Toyota just dont want to deal with it.