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 injection pattern
The injection pattern of the metering module must consist of three evenly distributed circles. To check, hold a piece of crepe paper at a distance of 20-40 cm before the uncovered metering module. Activate the metering module with the diagnosis system.
| Item | Explanation |
|---|---|
| 1 | Metering module: Valve opening |
| 2 | Injection pattern of the metering module on paper |
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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.