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.
Injectors, removing and installing
Only vehicles with engine code ALH
Recommended special tools and equipment
- V.A.G1331 torque wrench (5 to 50 Nm)
- 3035 Injector line wrench
- Rough engine idle
- Diesel knock
- Knocking in one or more cylinders
- Engine overheating
- Loss of power
- Excessive black smoke
- High fuel consumption
- Excessive black smoke during cold start
Malfunctioning injectors can be located by loosening the injector line union nuts on each injector in turn, with the engine running at a fast idling speed. If the engine speed remains constant after loosening an injector line union nut, this indicates a malfunctioning injector.
Removing
- Remove injectors lines using 3035 injector line wrench.
- Loosen securing bolt, remove tension bracket and injector.
- Cover openings with a clean rag.
Installing
- Insert injectors.
- Be sure mounting brackets are properly seated in cylinder head.
- Insert tension bracket.
Tightening torques:
Injector lines = 25 Nm
Tension bracket bolt = 20 Nm
- Erase DTC memory of control module for Diesel-Direct fuel injection system. Refer to Diagnostic mode 4: Reset/erase diagnostic data .
- Generate readiness code.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.