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Code 16: (EGR Switch - CALIF)

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. 16 Diagnostic Chart (EGR Switch - California)
G93D80625
Fig 2: Trouble Code No. 16 Schematic (EGR Switch - California)
G93E80626