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• 18:52, 6 July 2026 Cliff talk contribs created page Code 13 (Created page with "'''Code 13''' is a diagnostic trouble code related to the oxygen sensor circuit on the Pontiac Fiero. Code 13 indicates that the ECM has detected a problem with the oxygen sensor signal or circuit. == Overview == The oxygen sensor is used by the ECM to monitor exhaust oxygen content and adjust fuel mixture during closed-loop operation. A Code 13 does not automatically mean the oxygen sensor itself is bad. The code may also be caus...")