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Why 98 sienna has no EGR valve then how to reduce NOx?

The 1998 Toyota Sienna does have an EGR (Exhaust Gas Recirculation) valve. The EGR valve helps to reduce NOx (nitrogen oxides) emissions by recirculating a portion of the exhaust gas back into the engine. This helps to lower the combustion temperature and reduce the formation of NOx.

Here are some ways to reduce NOx emissions from a 1998 Toyota Sienna:

* Keep the engine tuned up and in good working order. A properly tuned engine will run more efficiently and produce fewer emissions.

* Use a high-quality fuel injector cleaner. This can help to keep the fuel injectors clean and free of deposits, which can help to reduce emissions.

* Drive smoothly and avoid unnecessary acceleration and deceleration. This can help to reduce fuel consumption and emissions.

* Inflate your tires to the recommended pressure. This can help to reduce rolling resistance and improve fuel efficiency, which can also help to reduce emissions.

* Use public transportation or carpool whenever possible. This can help to reduce the number of vehicles on the road and reduce overall emissions.

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