Lexus GX460 throttle body failure requiring replacement after loss of power at traffic light on Lexus GX460

Some Lexus GX460 owners report experiencing loss of power at traffic lights due to potential throttle body failure, which may require replacement. Common issues contributing to slow acceleration include clogged air filters, dirty mass air flow sensors, and clogged fuel filters. Signs of a failing throttle body can manifest as dirt buildup inside the housing, leading to interruptions in air-fuel flow. Symptoms may include rough idle, rough acceleration, engine misfires, or stalling, along with changes in fuel consumption and fluctuating idle. Additionally, throttle body problems can lead to rough or high idling, engine stalling, and check engine light warnings. While replacing a faulty throttle body typically costs around $500, some owners find that cleaning the throttle body resolves the issue without the need for replacement. It is advisable for owners experiencing these symptoms to have the throttle body inspected to restore proper engine performance and responsiveness.