Mechanic Reveals Hidden Cause of Persistent 'Check Gas Cap' Warning

A recent video by Royaltyautoservice highlights a common car repair issue: the "check gas cap" warning that persists even after a gas cap replacement. The video features a mechanic who uses a diagnostic scanner to pinpoint the problem as a faulty ESIM (Evaporative System Integrity Monitor) switch on a 2016 Dodge Dart. The mechanic, in the video, states, "When you've got a gas cap left loose code, it means there's a large leak in the EVAP system." He then proceeds to replace the faulty switch, demonstrating the repair process. After the repair, the scanner confirms the issue is resolved. This case underscores the importance of proper diagnostics rather than assuming the gas cap is always the cause of the warning.