603 MTech Autowerks

603 MTech Autowerks New England’s Trusted Independent Mercedes-Benz Specialists We service most Euro makes including Audi, VW, and BMW.

- Streamlined Customer Experience
- Competitive Pricing
- Factory Diagnostic Equipment & Tools
- 24,000 Mile / 24 Month Warranty

Specialized in Mercedes-Benz.

09/22/2026

Are OEM parts always the same as genuine parts? The manufacturer’s name on the box doesn’t tell the whole story.

In this video, we compare two Delphi ignition coils and explain how replacement coils kept bringing back the same fault code on one of our Mercedes loaners. Installing the genuine Mercedes coils resolved the issue.

OE means original equipment, while OEM means original equipment manufacturer. But buying a part from an original equipment supplier doesn’t automatically mean it’s identical to the genuine part. This is why we’re selective about the parts we install.

09/18/2026

Buying a used engine can save you thousands, but installing it exactly as it arrives can turn into an expensive mistake. Before installation, the engine should be thoroughly inspected and common failure points should be addressed while everything is easily accessible.

Replacing worn seals, mounts, pulleys, and other failure prone components now can help prevent additional labor and unexpected repairs later. If you’re considering a used engine replacement, this is what should happen before it goes into the vehicle.

Would you install a used engine as is or refresh it first?

09/17/2026

This 2008 Mercedes CL65 AMG has only 71,000 miles and is powered by a hand built V12 biturbo engine.

These older AMG models are incredible, but they can also become expensive to maintain. The ABC hydraulic suspension, limited engine access, and aging parts can quickly add up. This CL65 is very clean, but it still needs a few important repairs, including an ignition coil, drive belt, and suspension work.

Would you own a V12 Mercedes?

09/16/2026

Aftermarket wheels can be a great upgrade, but proper fitment is extremely important. On this Mercedes, incorrect installation damaged the lug bolt holes, turning what should have been a simple wheel install into an expensive hub, wheel bearing, and fl**ge replacement.

We also have another customer who purchased wheels without checking fitment first. They’re too wide, and now spacers may be needed just to make them work.

Before buying aftermarket wheels, make sure the offset, width, hub bore, and hardware are correct. We highly recommend using a shop that specializes in aftermarket wheel fitment.

09/15/2026

We’re installing a used M112 engine in this 2005 Mercedes E320 with 190,000 miles. The original engine still ran, but it needed a head gasket and was producing a large amount of smoke from the exhaust. Rather than rebuilding it, the client found a used replacement engine for a little over $1,000.

A used engine is not something we simply install and hope for the best. While everything is accessible, we inspect it thoroughly and address potential problems. We found a cracked intake manifold, so we may reuse the good manifold from the original engine. We’re also replacing gaskets and addressing the ignition coils, spark plugs, oil leaks, and other maintenance items before installation.

Would you invest the money to keep a 2005 E320 on the road?

09/14/2026

This 2008 Mercedes G55 AMG was towed to us from Vermont after it died once it warmed up and would not run. After diagnosing the problem, we found that a failed crankshaft position sensor was preventing it from running.

Once the G55 was running again, we addressed several other concerns, including the spark plugs, parking brake, heated seats, and warning lights. With only 90,000 miles and a supercharged V8, this is still one unique Mercedes. These older G Wagons are rugged, built differently, and have a personality unlike almost anything else Mercedes has made.

Would you own an older G55 AMG?

09/10/2026

This 2016 Mercedes E63 AMG wagon received a complete rear suspension refresh costing over $4,000. We replaced the adaptive rear shocks, air springs, lower control arms, and rear air lines to restore the suspension to the way it felt when it left the showroom floor.

This is what goes into properly refreshing the rear suspension on an E63 AMG wagon.

09/09/2026

This 2015 Mercedes S63 AMG with 132,000 miles was diagnosed with a communication fault involving the transmission control unit. The control unit is integrated into the valve body assembly and manages the operation of the transmission.

Replacement requires draining the transmission fluid, removing the transmission pan, disconnecting the electrical connection, and removing the complete valve body and control unit assembly. After the replacement assembly is installed, the transmission must be refilled with new fluid and the new control unit must be programmed.

If your Mercedes needs a transmission control unit replacement, this video shows what to expect during the repair process.

Today we’re celebrating Jesse’s two year anniversary with MTech. A lot of people probably don’t see Jesse when they come...
09/04/2026

Today we’re celebrating Jesse’s two year anniversary with MTech. A lot of people probably don’t see Jesse when they come into the shop because he works part time and does a lot behind the scenes. He helps clean and organize the shop, picks up parts, takes vehicles on extended test drives for quality control, and washes and vacuums the vehicles to get them ready for pickup.

What makes Jesse very special is that this is his second job. He works a full shift at his regular job and then comes in afterward to help us. He is a very hard worker, and his work ethic does not go unnoticed. Thank you Jesse, for everything you do and for being a great part of MTech.

Happy two years!

09/03/2026

This Mercedes owner accidentally locked his keys inside the trunk. He called several companies, and evmobilemechanice assistance company sent by his insurance could only unlock the driver’s door. Because the keys were still inside the trunk, the trunk release button remained disabled.

We loaded up our diagnostic scan tool and drove 35 minutes to see if we could help. After accessing the central locking system, we commanded the trunk to unlock, and it opened immediately.

The client’s reaction made the entire trip worth it. Sometimes the right diagnostic equipment and Mercedes knowledge can solve what seems like an impossible problem.

Address

1298 Smyth Road Unit 24 & 25
Hooksett, NH
03106

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 4pm
Friday 8am - 4pm

Telephone

+16032326500

Website

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