What might cause my 2007 Buick Lucerne check engine light to come on?

You're takeng an afternoon drive in Your 2007 Buick Lucerne, when You suddenly notice Your check engine light has come on. There are a few culprits that could be behind this, so You will need to narrow it down. First, You should know that the main reason the engine light illuminates randomly is due to a few simple problem. If You recently refueled, check Your gas cap to make sure You closed it correctly, and securely. If You're experiencing a knocking noise from the front of the engine, You likely have low oil pressure. This can be resolved by refilling the reservoir with SAE 5w-30 fully synthetic motor oil. If there is a leak from the exhaust, such as smoke, You may be experiencing higher levels of oxygen than is safe for Your system.