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I started smelling ammonia when a drive. What can be the reason?

I did recently changed the exhaust pipe. I drive infinity G35.

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Have you changed the cabin filters lately?

Black mold can smell like Urine-Ammonia, this mold can also grow on the ac evaporator coil.

Pull the cabin filters and check for mold.

Other than this it could be a rich running engine that causes the catalytic converter to put out strong odors.

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