Dodge Nitro check engine light issue persists despite multiple gas cap replacements on Dodge Nitro

Some Dodge Nitro owners report experiencing persistent check engine light issues despite multiple gas cap replacements. These problems can often be attributed to a loose, broken, or missing gas cap, which is a common trigger for the warning light. However, the "check fuel cap" indication may also point to underlying issues within the EVAP system, where the gas cap itself may not be the root cause. Additionally, some owners may find that malfunctioning components such as the purge valve, PCV hose, or leak detector associated with the EVAP system contribute to the warning light activation. Proper installation of the gas cap is essential, as using a universal gas cap may fail to create an adequate seal. If repeated replacements do not resolve the issue, it is advisable for owners to have other EVAP system components inspected and to seek professional diagnostic assistance to accurately identify the problem.