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2002 Mazda Protege5, how much is it to fix diagnostic trouble code P0031 and P0660?

Vehicle: 2002 Mazda Protege5

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P0031 MAZDA - HO2S Heater Control Circuit Low
Read more: https://www.autocodes.com/p0031_mazda.html

P0660 MAZDA - Secondary Shutter Valve Open
Read more: https://www.autocodes.com/p0660_mazda.html

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