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• 18:57, 6 July 2026 Cliff talk contribs created page Code 21 (Created page with "'''Code 21''' is a diagnostic trouble code related to the Throttle position sensor circuit on the Pontiac Fiero. Code 21 indicates that the ECM is seeing a throttle position sensor signal voltage that is higher than expected. == Overview == The throttle position sensor, often abbreviated as TPS, tells the ECM how far the throttle is opened. The ECM uses the TPS signal for fuel control, acceleration enrichment, idle control, de...")