Mercedes Viano Transmission Issues Resolved

I understand your concern regarding the issues you are experiencing with your Mercedes Viano I had a similar situation arise with my Viano, although I did not experience the grinding noise you described The transmission going into emergency mode and the warning lights are indicative of a problem Based on the error code you mentioned, a faulty connection to the pressure sensor is a strong possibility Have you inspected the wiring and connectors in that area for any signs of damage, corrosion, or loose connections? A thorough leak detection procedure may also be beneficial to rule out any coolant leak that could be affecting the system Think of it like a chain reaction; a small problem with a sensor can cause a cascade of issues in the transmission control system The oil cooler could also be involved if it's integrated with the radiator and there's a pressure issue there

Thanks so much for the quick reply I haven't really dug into the wiring yet, to be honest I'm not the most mechanically inclined Where exactly is this pressure sensor located, and what should I be looking for in terms of damage or corrosion? Is there a common spot where these things tend to fail, or is it just tracing the wires from the radiator?

You are welcome While I can guide you, given your description of your mechanical expertise and the potential severity of transmission issues, I must strongly advise that you seek professional assistance However, to answer your question, the pressure sensor is typically located on or near the radiator, often in proximity to the oil cooler lines The wires connecting to it are exposed to the elements and engine heat, so they can become brittle or corroded over time Carefully inspect the connector itself for any signs of damage, such as cracks or broken pins If possible, use a multimeter to check for continuity in the wiring harness That being said, this is a complex system, and without proper diagnostic equipment and experience, you could inadvertently cause further damage At this stage, professional leak detection is key I suggest you have a qualified technician perform a thorough inspection and diagnosis before attempting any repairs yourself

Okay, I hear you I took it to a mechanic Turns out it was indeed a faulty cable connection to the pressure sensor, just like you suspected They cleaned it up, reconnected it, and cleared the codes Total cost was 95€! Runs like a charm again Thanks a million for your help Seriously saved me a ton of stress!