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1999 Mazda Protege DX automatic transmission problems

sunflower8sunflower8 Posts: 1
I have a 1999 Mazda Protege DX that has error codes PO731 and PO732. The car starts out running great but 3 blocks in and the o/d light starts flashing and the car seems to stick in 3rd gear. If I only drive 30-45 miles an hour it runs great but it won't shift into 4th gear.

The mechanic said I need a new transmission for around 2500-2800 dollars.
We took off the pan today and changed the fluid and added the Lucas transmission treatment fluid and it ran great 3 times around the block and then back to the same old problem.

Any advice on what to check next before replacing the transmission?


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1999 Mazda Protege DX automatic transmission problems - Car Forums at