Mercedes-Benz Diesel Repair in Austin, TX
Sprinters, BlueTEC SUVs, and the OM642 V6 that powers both — European diesels need a shop that knows their specific failures.
Mercedes-Benz diesel service at an independent Austin shop
Mercedes diesels are precise, well-built engines with a short list of very well-known weak points. Knowing that list is most of the job: an oil leak on an OM642 is a specific job with a specific cause, and a BlueTEC emissions fault is rarely the part the code names. We diagnose to the actual failure rather than reading a code and ordering a part.
Mercedes diesel engines we service
- OM642 (3.0L V6 CDI) — The workhorse — Sprinter vans plus ML, GL, E, R, and S-Class diesels. Oil cooler seals, swirl flaps, injector seals.
- OM651 (2.1L four-cylinder) — Later Sprinters and passenger cars — injectors, timing chain wear on early units, and turbo actuators.
- BlueTEC / AdBlue models — DEF heaters, NOx sensors, and SCR faults that end in a countdown to no-start.
- Sprinter vans — Mercedes, Freightliner, and Dodge badged — same platform, see our Sprinter page.
What we see fail on Mercedes-Benz diesel
- Oil cooler seal leaks (OM642) — The signature failure — oil weeping down the valley between the heads. Labor-heavy, and worth doing once with the right seals.
- Injector seal failure — Blow-by around the injector that carbons into the bore — caught early it stays a seal job.
- Swirl flap and intake carbon — Runner flaps and linkage that seize, along with the intake carbon that comes with EGR.
- AdBlue / DEF system faults — Heaters, quality sensors, and dosing failures that count a vehicle down to no-start.
- Glow plug and hard-start problems — Failed plugs and glow modules — a rough winter start with no dash warning.
Mercedes-Benz diesel work we handle
- OM642 and OM651 diagnostics with live data
- Oil cooler seal, injector seal, and engine oil-leak repair
- Swirl flap, EGR, and intake carbon service
- AdBlue/DEF and BlueTEC emissions diagnosis and repair
- Glow plug, sensor, and electrical diagnostics
- Scheduled maintenance and oil service to Mercedes intervals
Modern Diesel is an independent, Christian, veteran-owned shop — we service Mercedes-Benz diesel engines but are not a dealer or affiliated with the manufacturer. Warranty coverage on our work is set with your service advisor at the time of service.
Related services
Other diesel platforms we service
Power Stroke · Cummins · Duramax · Detroit Diesel
Bring it to the shop
We work on Mercedes-Benz diesel at our shop at 2900 N FM 973, Austin, TX 78725, serving the Greater Austin Area (Travis, Bastrop, Williamson, Hays) — Austin, Del Valle, Manor, Elgin, Pflugerville, Round Rock, and the surrounding counties. Call 512-717-2777 and tell us what it's doing, or send us the details and we'll get back to you.
Common questions
My Mercedes diesel is leaking oil down the back of the engine. What is it?
On an OM642 V6 that is almost always the oil cooler seals, which sit in the valley between the cylinder banks. It is a labor-heavy job because the intake has to come off to reach them, which is exactly why it is worth doing properly with updated seals rather than twice.
My BlueTEC is counting down to no-start over an AdBlue fault. Can you fix it?
Yes. Those countdowns come from the SCR system — a DEF heater, quality or NOx sensor, or a dosing fault — and the code often names a part downstream of the real problem. We diagnose the system, repair the cause, and reset the countdown properly instead of clearing it so it returns in a few hundred miles.
Do you work on Sprinter vans as well as Mercedes cars and SUVs?
Yes, and they share engines — the OM642 V6 turns up in Sprinters and in ML, GL, and E-Class diesels alike. Sprinter vans have their own page since the service needs are different, but the engine work is the same bench.
Ready when you are.
Drop by the shop at 2900 N FM 973, Austin, TX 78725 or call and we’ll get you scheduled.