Lexus RX350 engine noise and chirping sound from brakes on Lexus RX350

Some Lexus RX350 owners report experiencing engine noise issues, such as a ticking sound potentially caused by low oil levels, ignition system problems, or exhaust leaks. Others have noted a knocking sound that may indicate engine knocking due to an improper air-fuel mixture, often linked to fuel delivery system issues affecting combustion timing. Additionally, some owners hear sounds from under the vehicle several hours after engine shutdown, which are typically normal fuel evaporation leakage checks rather than a malfunction. Regarding chirping sounds from brakes, some Lexus RX350 owners report that these noises can stem from various components, including the belt tensioner pulley and rocker arms. A worn serpentine belt may also lead to chirping due to slippage, while a loose or improperly tensioned belt can cause squealing. Furthermore, grinding noises during braking are often reported as signs of worn-out brake materials, indicating an urgent need for brake repairs. Addressing these issues promptly is crucial for maintaining vehicle performance and safety.