MERCEDES OM642 Diesel Injectors
Buy MERCEDES OM642 diesel injectors, OEM tested and calibrated to original specifications. All injectors include 12-month warranty and are in stock for fast UK delivery.
0 compatible injectors • OEM Tested • 12-Month Warranty
Remanufactured Injector stocks MERCEDES OM642 diesel injectors tested to OEM specifications. Each OM642 injector includes new seals, nozzles, and 12-month warranty. UK-based specialists with same-day dispatch. Find your exact part below.
For OM642 engines, most issues are confirmed with testing before replacement.
What happens next
Take your time — we're here when you're ready.
The Mercedes OM642 is a 3.0-litre V6 diesel producing 190-265PS, powering Mercedes' luxury and performance diesel range from 2005 to 2018. Using six Bosch piezo injectors, the OM642 delivers effortless torque and refinement. Our remanufactured OM642 injectors restore the smooth V6 character these engines are known for.
Vehicles Using the OM642 Engine
MERCEDES E280 CDI / E300 CDI / E350 CDI
E-Class W211/W212
2005-2018
MERCEDES ML280 CDI / ML300 CDI / ML350 CDI
ML W164/W166
2005-2018
MERCEDES S320 CDI / S350 CDI
S-Class W221
2006-2013
MERCEDES R280 CDI / R300 CDI / R350 CDI
R-Class W251
2006-2017
MERCEDES GL320 CDI / GL350 CDI
GL-Class X164/X166
2006-2015
Common OM642 Injector Problems
Piezo element fatigue causing rough running at idle
Bank-to-bank injection imbalance (V6-specific)
Oil contamination from intake swirl valve failures
Injector bore scoring in high-mileage engines
Return line manifold cracks causing fuel leaks
Available MERCEDES OM642 Injectors
No injectors currently listed for the OM642 engine code.
Browse all MERCEDES injectors →Why Remanufactured Injectors Are Recommended for OM642
OM642 has six injectors in V-configuration, requiring partial intake manifold removal for access. Code using XENTRY with individual injector calibration values. Due to the V6 layout, labour costs are higher - consider addressing all six injectors simultaneously if multiple show wear.
The MERCEDES OM642 engine requires injectors calibrated to specific flow rates and spray patterns. At Remanufactured Injector, our technicians test every OM642 injector to original manufacturer specifications using OEM-grade diagnostic equipment.
MERCEDES OM642 Injector Cost
MERCEDES OM642 diesel injector replacement cost UK ranges from £150 to £400 per injector for remanufactured units. The OM642 engine uses precision-calibrated injectors that require exact flow rates and spray patterns.
Testing OM642 injectors costs £20 each and confirms which specific injector is causing problems. Common OM642 symptoms like rough idle, black smoke, or poor fuel economy often stem from just one faulty injector.
Our remanufactured OM642 injectors are tested to MERCEDES original specifications with new seals, nozzles, and 12-month warranty included. Same performance as new, significantly lower cost.
When to Test vs When to Replace
Test Injectors When...
- • Engine warning light appeared but car still runs
- • Fuel economy has dropped noticeably
- • Rough idle or hesitation on acceleration
- • You want to confirm which injector is faulty before buying
- • Garage quotes full set replacement but you want a second opinion
Replace Injectors When...
- • Testing has confirmed injector failure
- • Visible damage, leaks, or Black Death carbon buildup
- • High mileage (150,000+ miles) and multiple symptoms
- • Previous repair attempt failed
- • Vehicle is undriveable or will not start
What Most Customers Choose
Testing first. At £20 per injector, testing identifies exactly which unit needs replacing — saving an average of £300-£600 by avoiding unnecessary full-set replacement. If testing confirms failure, we credit the test cost against your injector purchase.
Common Questions
Will this fix my problem?
If your issue is caused by a faulty injector, yes. Our injectors are tested to OEM specifications and will restore proper fuel delivery. If you're unsure, we recommend testing first — it's only £20 per injector and confirms exactly what's wrong.
What if testing shows they're OK?
That's good news — it means your injectors aren't the problem. You've spent £80 to potentially save £600+ on unnecessary parts. We'll help you identify other possible causes based on your symptoms.
How fast is delivery?
Next working day delivery on orders before 2pm (UK mainland). Most items ship same day from our UK warehouse. You'll receive tracking details by email once dispatched.
Same decision most professional mechanics make.
What You Get
No irreversible steps until results are confirmed.
MERCEDES OM642 Injector FAQs
Content reviewed for accuracy in 2026
Other MERCEDES Engine Codes
Common Problems with MERCEDES OM642 Injectors
The MERCEDES OM642 engine commonly experiences injector issues related to the infamous "Black Death" carbon buildup around injector seals, electrical connector corrosion, and copper washer degradation causing compression leaks. Mercedes OM642 injectors require specialist attention to prevent cylinder head damage. Professional testing identifies exactly which injector is failing before expensive replacements.
Symptoms of Failing MERCEDES OM642 Injectors
Failing MERCEDES OM642 injectors typically cause: rough idle or vibration at standstill, excessive white or black smoke on startup, poor acceleration and "limp mode" activation, increased fuel consumption (10-20% worse), engine warning light with P0201-P0204 fault codes, hard starting especially when cold, and diesel knock or rattling sounds. Early diagnosis prevents secondary damage to turbochargers, DPF systems, and cylinder walls. If you notice any of these symptoms, professional injector testing (£20/injector) can confirm the diagnosis before committing to replacement.
Popular MERCEDES Models
Browse Mercedes diesel injectors by vehicle model.
Mercedes C-Class
View diesel injectors →
Mercedes C220
View diesel injectors →
Mercedes E220
View diesel injectors →
Mercedes Sprinter
View diesel injectors →
Related MERCEDES OM642 Resources
All MERCEDES injectors
Browse full range
Test your OM642 injectors
£20 per injector diagnostics
Injector warranty coverage
12-month comprehensive warranty
Shop OM642 replacements
OEM tested & calibrated
This guide is updated regularly to reflect the latest injector data and testing standards.
Other MERCEDES Engine Codes
Browse Injectors by Brand
Need Help Finding Your MERCEDES Injector?
Our UK diesel specialists are here to help. Enter your registration above or call us.
020 3355 6581 (Free)