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1994
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Protege DX, Automatic
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Engine Controls - Tests W/Codes
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Trouble Code Identification
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Code 28: (EGR Vacuum Valve Solenoid)
Code 28: (EGR Vacuum Valve Solenoid)
Fig 1: Trouble Code No. 28 Diagnostic Chart (EGR Vacuum Valve Solenoid )
Courtesy of MAZDA MOTORS CORP.