Thanks Herbie for the response. I have now replaced both ride height sensors on my 2010 RX450h SE-L but have another problem. The dash warning messages have gone with the change of sensors however the car seems to have 'settled' on it's suspension, with the shocks not absorbing! I'm feeling every bump, there's no shock travel and the local guy who replaced the sensors is unsure what to do next. I'm guessing that the air suspension is not pumping up, does that sound right and can anyone tell me how to remedy the problem? Thanks in advance for any responses!