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• 19:03, 6 July 2026 Cliff talk contribs created page Code 45 (Created page with "'''Code 45''' is a diagnostic trouble code related to a rich exhaust indication on the Pontiac Fiero. Code 45 indicates that the ECM is seeing an oxygen sensor signal that suggests the engine is running rich. == Overview == The Oxygen sensor monitors oxygen content in the exhaust. The ECM uses this signal to adjust fuel mixture during closed-loop operation. Code 45 is set when the ECM detects a rich exhaust condition for longe...")