Renault Master excessive fuel consumption

I had similar symptoms with my Master. Have you checked the throttle position sensor? That could be faulty and affect the fuel mixture and starting.

Interesting. Where is this sensor located, and is it a straightforward replacement? I wouldn't call myself an expert.

On my engine, it was near the throttle body. If you're seeing higher fuel consumption and starting issues, it's best to have a workshop take a look. They can properly diagnose it.

Thank you for the advice! You were spot on; the workshop confirmed that the accelerator pedal module was defective, and the repair set me back 205€. Now it is running like a charm again.