Does the Lexus is250 have a timing belt or chain?

The Lexus IS250 is equipped with a timing chain. The positive side of this is that a chain is designed to last the life of the vehicle, unlike a belt, which needs routine replacement. However, if You do have to replace the chain for some reason, it's a very expensive part to have installed. The average cost to replace this part in the IS250 is $1,870 to $2,300. Labor accounts for roughly $1,620 to $2,050 as this is difficult and time-consuming service work. The most common symptom of a failing chain is rattling noise in the engine compartment. Since this part is in constant motion, friction can break small pieces off, which land in the oil drain pan and bounce around while the vehicle is moving. If You hear a rattling noise, schedule an appointment right away. The chain ultimately controls the opening and closing of intake and exhaust valves by keeping the camshaft and crankshaft synC-HRonized. A broken one can result in very expensive engine damage.