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• 19:01, 6 July 2026 Cliff talk contribs created page Code 42 (Created page with "'''Code 42''' is a diagnostic trouble code related to the electronic spark timing circuit on the Pontiac Fiero. Code 42 indicates that the ECM has detected a problem in the electronic spark timing system. == Overview == The Fiero ignition system uses electronic spark timing control. Under normal operation, the ECM can control ignition timing through the ignition module and related wiring. Code 42 is set when the ECM detects an une...")