Jeep Wrangler persistent check engine light issue with no overheating on Jeep Wrangler

Some Jeep Wrangler owners report experiencing persistent check engine light issues without any signs of overheating, which can stem from various factors such as a loose gas cap, malfunctioning spark plugs, faulty sensors, or a dirty air filter. These owners note that the check engine light is a critical indicator of vehicle health, potentially signaling problems ranging from minor inconveniences to serious mechanical failures, including faulty oxygen sensors and malfunctioning fuel injectors. In specific instances, owners have observed the check engine light activate after extended driving, with codes indicating cylinder misfires, yet the vehicle continues to operate smoothly without loss of power or smoke. Additionally, some owners find that clearing trouble codes and resetting the check engine light can mitigate issues related to the ignition system, particularly with faulty coils or wires. If the Malfunction Indicator Lamp illuminates alongside misfire codes, it may be accompanied by engine vibration. Furthermore, in cases where overheating is not present, some owners suspect a stuck open thermostat as a possible cause, although they are advised to check coolant levels before further operation. These experiences underscore the importance of diagnosing and addressing the various potential causes of a persistent check engine light in the Jeep Wrangler.