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It often starts after a simple repair. You replace a fuel injector, clean the throttle body, or reconnect the battery then the engine runs rough, idles high, or throws new fault codes. The problem isn’t the part; it’s that modern vehicles must be electronically relearned and calibrated. This is where many basic scan tools fail and where the right diagnostic scanner makes all the difference. In this Top 3 OBD2 Scanners for Injector Coding & Throttle Relearn in 2026: Expert Reviews …