Mercedes GT Roadster hybrid exhaust back pressure sensor issue

I understand your frustration regarding the exhaust back pressure sensor malfunction in your Mercedes GT Roadster I had a similar issue While I am not an expert, have you performed any preliminary checks on the sensor itself and its wiring harness A visual inspection for any obvious damage, such as frayed wires or loose connections, might provide some insights Also, have you checked the sensor's electrical connector for corrosion, as this could impede its proper functioning Ensuring the sensor is clean and free from any debris might also prove beneficial

Appreciate the response I did a quick visual, but nothing jumped out Where exactly is that pressure sensor hiding And when you say "checked the sensor's electrical connector for corrosion", how deep do I need to go I'm comfortable with basic car maintenance, but I don't want to start tearing things apart without a clearer picture

You are most welcome In my case, the sensor was located near the diesel particulate filter However, the exact location may vary slightly Given the complexity of modern vehicle emissions systems, and to avoid any unintended complications, I would strongly advise consulting a qualified technician for a precise diagnosis and repair Continuing to drive the vehicle in its current state could potentially exacerbate the issue and lead to more costly repairs It appears that you have already determined the cause of the issue via vehicle diagnostics, so a visit to the workshop would be beneficial to resolve your issue

Thanks for the advice I took it to the shop as suggested Turns out you were spot on - the exhaust back pressure sensor was indeed defective New sensor installed, DPF regeneration forced, and the car is back to its old self Cost me the quoted 245€, but at least the smoke show is over