Engine timing code P052E71, what does it mean?

Hello, are you going after this crankcase ventilation code, or the intake cam sensor code?

Okay so, it's a Hall effect sensor, 3 wire, it works off a 5v reference. I don't see that code listed in service info, but since it states the sensor is shorted to B+, it sounds like the signal wire is reading higher than 5 volts. I will keep looking through service info, but Ill post a wiring diagram of it, you can back probe the sensor signal wire and see what its reading for voltage while the vehicle is running. Just looking at the aftermarket diagrams right now, the sensor shares a Ground with the Exhaust cam sensor and a 5v reference with a bunch of other sensors. I pulled up the crankcase ventilation operations as well if you need that.
I will double check the OEM diagrams to make sure these are correct, but I would first just see what the voltage level is on the signal wire, even with just the key on engine off. If it's shorted to 12-volts, it should show up at key on.

Here is its location, but can I get the vin for this, SI is showing 2 different CLA 250 models.

Okay, I found it on OEM SI. The wire colors are correct on the aftermarket diagrams, so the red/black wire is your signal wire to the DME.

I'd check that it has its 5v Ref and nothing on the signal wire unplugged, maybe they were getting that code too previously, unless you clear the code and it doesn't come back.

Yeah, I would see what voltage level the signal is at, the DME might default to some strategy with the sensor unplugged. The sensors signal wire could be shorted to power somewhere on its way to the DME, I would think by the code definition the DME is seeing a voltage lever higher than 5volts or you would just have a circuit or performance code for the sensor. There's probably some voltage threshold that's its over and that is what the DME is fussing about.