This guide is wriiten to hopefully answer most of the often asked questions about the 2AD 2.2 Diesel engine and its problems. The Symptoms Owners complain of the following; Excessive oil consumption. Coolant Water being blown out of the expansion tank and the colour sometimes turning darker in colour. Excessive Fuel consumption. Blocked or heavily sooted EGR valves And of course cars going into limp mode or displaying fault codes relating to this engines issues. Toyotas Answer. Well Toyota rea