A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.
What you can do yourself
- Only on vehicles with a diesel particulate filter.
- First, on your own: inspect the sensor connector and wire near the exhaust pipe — melted insulation, corrosion, water.
- Check the temperature sensor and connector.
Stop and don’t drive on if:
- The Check Engine light is flashing
- The temperature gauge is in the red or the overheating light is on
- The red oil pressure light is on
- Smoke from under the bonnet, a burning or petrol smell
- Strong jerking, knocking from the engine, or the car barely moves
Add the FMI — the second number of the code. It shows what exactly is wrong with the parameter.
Source: Navistar IK1200516: MaxxForce DT 9/10 DTC (static.nhtsa.gov, MC-10167665)
The explanation comes from the error code reference in the AvtoElektrik PRO app.