Q
can a gas cap cause engine light to come on
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Yes, a loose or faulty gas cap can indeed trigger the Check Engine Light (CEL) to come on. This occurs because a gas cap that doesn't seal properly can allow fuel vapors to escape from the tank, which disrupts the vehicle's evaporative emissions (EVAP) system. Modern vehicles are equipped with sophisticated EVAP systems designed to reduce harmful emissions by capturing fuel vapors before they can escape into the atmosphere. When the system detects a leak, often due to a compromised gas cap seal, it triggers the CEL as a warning. Simply tightening a loose cap or replacing a damaged one can often resolve the issue. However, if the light remains illuminated after addressing the gas cap, further diagnostics might be necessary as the EVAP system can be affected by various other faults.
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