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.
Fuel Injector Leakage Inspection
Remove the spark plugs. Note the cylinder from which each spark plug was removed. Check that none of the spark plugs have a lighter or darker color than the others. If any of the spark plugs are lighter or darker, this may be an indication of a defective injector. Replace as necessary. See FUEL INJECTORS under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION - S40 & V40 article.
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.
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