Jeep Grand Cherokee check engine light due to bad bearing and oil contamination issues on Jeep Grand Cherokee

Some Jeep Grand Cherokee owners report experiencing the check engine light illumination due to common issues such as a malfunctioning oxygen sensor, which can negatively affect engine performance. Others have noted that a loose or damaged gas cap may lead to fuel evaporation, while some face problems with a faulty catalytic converter impacting emissions. Additionally, issues with the mass airflow sensor and failing spark plugs or wires have also been reported. If owners suspect that bad bearings or oil contamination may be the cause of the check engine light, it is recommended to seek a comprehensive diagnostic check from a qualified mechanic to accurately identify and resolve the underlying issue.