Some Hyundai Tucson owners report experiencing serious engine issues, such as stalling, excessive oil consumption, and engine knocking, particularly in models from 2015 to 2020, often attributed to a lack of lubrication. These problems can lead to severe consequences, including engine seizure, which may necessitate a complete engine replacement. The cost of replacing an engine can vary significantly, with used engines for the 2016 model typically ranging from $4,000 to $6,000. Additionally, some owners are concerned about safety risks associated with engine failures, including the potential for engine fires, prompting Hyundai to issue recalls for affected models. While Hyundai has addressed engine defects through recalls and warranty extensions, it's crucial for owners to verify if their vehicle is covered. In instances where sourcing a new engine proves challenging, some owners consider using a remanufactured long block with a warranty as a viable repair option. Promptly addressing engine issues is essential to prevent further damage and ensure the vehicle's safety and reliability.

Some Nissan Pathfinder owners report experiencing stalling issues after 15 minutes of driving, which can often be resolved by replacing the crankshaft sensor. However, if a knocking sound continues even after this replacement, owners may encounter additional problems such as low oil levels, ignition issues, timing problems, worn rod bearings, or faulty knock sensors. A malfunctioning knock sensor may lead to engine knocking and could trigger a trouble code like P0325. Furthermore, worn rod bearings, situated between the crankshaft and piston rods, are known to produce knocking sounds. If the check engine light remains illuminated after the crankshaft sensor replacement, it might indicate improper installation or unrelated issues with the fuel or ignition systems. While a faulty crankshaft sensor can indirectly contribute to engine knock by sending inaccurate data to the engine control module, it is not typically a direct cause of knocking sounds. Therefore, if the knocking persists, further investigation into these potential causes is advisable.