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Depending on the model year, your Lexus NX will either come equipped with a timing belt or a timing chain. Generally speaking, you can anticipate it having a timing chain since Lexus has been using them in all their vehicles since the mid-2000s. This is due to their superior reliability and infrequent need for replacement. However, if issues arise, such as loud squealing or rattling noises from the engine, it indicates a problem. The cost of replacing a timing chain for a Lexus NX200t is typically around $180, with the part number being 13506-36030.
The Lexus NX comes with a timing chain that doesn't need any maintenance or replacement compared to a belt.