Lexus RX VANOS Issue

Sounds familiar. I drive an RX too. I had a similar problem a while back with the check engine light and mileage tanking. VANOS... yeah, variable valve timing. It's all about optimizing engine performance. If those solenoids get gunked up with oil sludge, they can cause all sorts of problems. Before you go tearing everything apart, have you checked the oil level and condition? Low or dirty oil can definitely mess with the VANOS system. Also, did the mechanic mention any specific error codes?

The mechanic mentioned error codes P0011 and P0012, indicating an issue with the 'A' Camshaft Position - Timing Over-Advanced or System Performance (Bank 1). The oil was changed approximately 5000 km ago, though I haven't personally inspected it since. Could oil sludge accumulate so rapidly even after a recent change? Is it possible to clean the VANOS solenoid without complete replacement?

Those error codes confirm it, sounds like a VANOS issue alright. 5000 km is usually not enough to cause major sludge, but it depends on the type of oil used and your driving conditions. As for cleaning, some people have had luck removing and cleaning the solenoids, but it’s a gamble. Sometimes the damage is already done, and they need replacing anyway. Honestly, at this point, I'd advise letting a professional take a look. They can properly diagnose the problem and tell you if cleaning is a viable option or if replacement is necessary.

Following your advice, I entrusted my Lexus to a reputable workshop. As suspected, the inlet camshaft solenoid valve was indeed faulty and required replacement. The final repair cost amounted to 250€, and the issue has been resolved. Your shared experience proved instrumental in navigating this predicament.