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Code 42: (Solenoid Valve - Turbo Pre-Control)

WARNING: This page is about a different car, the 1994 Mazda RX-7. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Trouble Code No. 42 Diagnostic Chart (Solenoid Valve - Turbo Pre-Control)
G93C80657
Fig 2: Trouble Code No. 42 Schematic (Solenoid Valve - Turbo Pre-Control)
G93D80658