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Code P0730--Incorrect Gear Ratio--1999 Cadillac Catera--What is the problem and the fix?

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Changed transmission fluid and flushed fuel system.

Vehicle: 1999 Cadillac Catera 3.0L

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P0730 Incorrect gear ratio

P0411 Secondary air injection incorrect flow detected

How was the transmission fluid? incorrect gear ratio is more than likely a slipping transmission , dealing with a internal codnition such as the clutches being worn.

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