GLA hybrid check engine light and rough running

I understand your concern regarding the symptoms you are experiencing with your Mercedes-Benz GLA hybrid I own a similar model Mercedes-Benz GLA and a few years ago I encountered a comparable issue The check engine light illuminated accompanied by erratic engine behavior Have you inspected the fuel pump relay and fuse It's a straightforward check that could potentially identify a simple problem within the fuel delivery system Also is the fuel filter relatively new or could it be restricting fuel flow to the fuel injector

Fuel pump relay and fuse are good and the fuel filter was changed recently Any chance yours was actually the fuel pressure sensor even with good wiring

Given that you have already verified the fuel pump relay fuse and fuel filter and considering the persistent symptoms it is plausible that the fuel pressure sensor is indeed defective despite the wiring appearing intact I recommend a diagnostic assessment at an authorized Mercedes-Benz workshop to confirm the fault and prevent potential damage to the fuel system

Took it to the workshop and you were right Turns out it was the fuel pressure sensor after all Cable or plug connection was defective as predicted Replaced it and the check engine light is off and the engine runs smoothly again Cost me 95€ Thanks for the advice