GarageNation assesses measuring fuel return from each injector under pressure to identify worn or leaking diesel injectors for compatible Mercedes E-Class variants in Hyderabad. Typical estimate: ₹2,000 – ₹5,000; workshop time: 1–2 hours; coverage: Test report included.
Variant disclaimer: Mercedes E-Class has multiple engines and transmissions. This page is not a claim that every variant uses this component; we confirm VIN, engine/transmission data and diagnostic results before approving work.
Repair is considered where testing confirms a serviceable component and safe parts availability. Replacement is recommended only for confirmed wear, damage or a failed test. A written estimate follows diagnosis; no work starts without approval.
What is the injector back-leak test?
The back-leak test measures how much fuel each injector returns to the tank (rather than injecting) per actuation cycle. A new injector returns 0–15 ml; a worn injector returns 80–200 ml. High return fuel means the injector needle is worn and can no longer hold the fuel in the injection chamber, so rail pressure collapses. GarageNation tests all injectors simultaneously in 30 minutes.
Can I drive with a high back-leak injector?
Temporarily, yes — but high back-leak reduces rail pressure, causing hard starting and power loss. More critically, it means that injector is delivering inconsistent fuel quantity — causing rough idle and potential misfires. Book within 1–2 weeks to prevent the rail pressure issue spreading to other injectors.
Explore all Injector Back-Leak Test repairs or the Mercedes E-Class service hub.
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