GLS hybrid height control and leveling sensor issue

Whoa, sounds familiar! I had almost the exact same headache with my GLS. The uneven ride height and weird headlight thing are dead giveaways. It's almost certainly a leveling sensor issue, like your mechanic said. These sensors are part of the air suspension system, and they tell the car how high it is. When the control rod goes bad on the leveling sensor, it throws off the whole system. The car gets confused about its ride height, and that's why you're seeing the error message and feeling every bump in the road. To be sure, which wheel is lower than the others?

The front seems to be the problem. The front axle is higher than the rear. Also, can you explain a bit more about how the leveling sensor and control rod work together, and how they affect the ride height?

Okay, front being higher is consistent with a sensor issue. Basically, the leveling sensor, also sometimes called a ride height sensor or load sensor, is attached to the suspension with that little control rod. As the suspension moves up and down, the rod moves the sensor arm. The sensor then sends a signal to the car's computer (ECU) telling it the ride height. The ECU uses this information to adjust the air suspension, keeping the car level. If the control rod is broken or bent, the sensor sends incorrect information, and the air suspension can't adjust properly. You'll probably need to visit a workshop, so they can use diagnostic tools to pinpoint the exact sensor. It's a relatively simple fix, and it shouldn't cost a fortune. The repair cost me around 110€ at a local mechanic.

I appreciate your help and insight. I took it to my local mechanic, and you were spot on. It was indeed the control rod on the leveling sensor. They replaced it, cleared the error code, and now the car is back to its normal ride height. The total cost was indeed around 110€. Thanks again!