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Code 9: (Coolant THERMOSENSOR)

WARNING: This page is about a different car, the 1994 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Trouble Code No. 9 Diagnostic Chart (Coolant Thermosensor)
G90D21579Courtesy of MAZDA MOTORS CORP.