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• 18:58, 6 July 2026 Cliff talk contribs created page Code 23 (Created page with "'''Code 23''' is a diagnostic trouble code related to the Manifold air temperature sensor circuit on the Pontiac Fiero. Code 23 indicates that the ECM is seeing a manifold air temperature sensor signal that represents an unusually low air temperature reading. == Overview == The manifold air temperature sensor, often abbreviated as MAT sensor, tells the ECM the temperature of the incoming air. The ECM uses this information for...")