2015 Mercedes GLK250 P2080 Fault Code: How to Locate the Correct Sensor and Identify the Right Part Number
I'm having difficulty identifying the exact location of the sensor associated with the P2080 fault code on my 2015 Mercedes GLK250. The OBD2 scanner indicates 'Sensor 1, Bank 1', but there are multiple sensors in the exhaust system, and the dealership provided a vague schematic with no clear diagram. The code is often referred to as an EGT (Exhaust Gas Temperature) sensor, but Mercedes-Benz does not use this terminology officially. The possible locations mentioned include: pre-turbo area, upstream of the catalytic converter, and before the DPFU (Diesel Particulate Filter Unit). I'm unsure which location corresponds to the correct sensor for P2080. Could someone please confirm the exact part number or sensor designation associated with this code? This will help me accurately diagnose and replace the faulty component. Any detailed explanation or reliable source would be greatly appreciated.
Possible causes for P2080 include: loose or corroded connectors, broken wires with exposed insulation causing a short to ground, a failed sensor, the installation of a catback exhaust system without EGT monitoring capability, and in rare cases, a malfunctioning engine control unit (ECU). Note that Mercedes-Benz does not use 'EGT' terminology officially; the correct term is typically 'Exhaust Temperature Sensor'. Always check for physical damage or corrosion at connection points before assuming sensor failure. For accurate diagnosis, refer to the official Mercedes-Benz service manual or OEM wiring diagrams specific to the 2015 GLK250 model.