Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SCR metering module
The SCR metering module is secured in the exhaust system before the SCR catalytic converter. The SCR metering module is activated by the SCR control unit.
The Digital Diesel Electronics (DDE) sends the request with the calculated volume of AdBlue and the release to the SCR control unit via the powertrain CAN. AdBlue is metered depending on the load (flow rate and exhaust-gas temperature), the temperature profile and the load profile.
The SCR metering module comprises the injector and a cooling system. The cooling system reduces the heat transfer from the exhaust gas to the injector.
| Item | Explanation |
|---|---|
| 1 | Oxidation catalytic converter with diesel particulate filter |
| 2 | Pressure line |
| 3 | SCR metering module with injector |
| 4 | two-pin plug connection |
| 5 | Cooling line connection |
| 6 | Pressure line connection |
| 7 | Cooling line connection |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.