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What is codes P0172 on a 2001 Toyota Sienna?

The P0172 code on a 2001 Toyota Sienna indicates that the fuel trim for Bank 1 is rich, meaning that the air-fuel mixture is too rich in fuel and not enough in air. This can be caused by several issues, including:

- A faulty氧气传感器

- A faulty fuel injector

- A problem with the fuel pressure regulator

- A problem with the mass air flow (MAF) sensor

- A vacuum leak

- An exhaust leak

It's important to diagnose and fix the cause of the code as soon as possible, as it can cause increased fuel consumption, decreased engine performance, and increased emissions.

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