Diesel Mechanic Portland OR

Full Service Diesel Repair From Expert Diesel Mechanics

Don’t trust just anyone with your truck. Come to Portland’s best diesel repair shop.

AG Automotive specializes in diesel maintenance and repairs for diesel trucks of all makes and models. From transmissions to engine repair, our team of experienced diesel technicians will treat your truck as if it were our own. When you need to get back behind the wheel as quickly and as safely as possible while knowing the job was done right, make AG Automotive your first call.

ADAS Service / Repair / Reset

Advanced driver-assistance systems (ADAS) need to be calibrated following any repair, service, or maintenance on your vehicle.

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Glow Plug System Inspection / Testing / Repair

Without a functioning glow plug, a diesel engine will have trouble igniting fuel in the combustion chamber, which can lead to idling, excess smoke emissions, and other issues.

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Cold Start Diagnostics / Repair

The cold start injector plays a key role in the performance, so when it does have issues the problems can detract from the overall drivability of the vehicle.

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Fuel Injection System Diagnostics / Service / Repair

Proper care of diesel fuel injectors will guarantee that your diesel engine is just as responsive and powerful as the day you bought it.

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Exhaust System DPF / SCR / DOC Diagnostics / Repair

The fuel and exhaust systems inside diesel engines work closely together, making it important to have a diesel engine specialist diagnosis your vehicle.

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Engine Diagnostics / Repair / Performance

Engine warning lights help alert drivers to minor issues before they become more complex and costly repairs, so it’s crucial to get things checked out as soon as you notice a warning sign.

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Check Engine Light / Warning Lights and Drivability Diag

If you notice a warning light on your dashboard, bring your vehicle in for a dashboard warning diagnostic service as soon as possible so you can drive with confidence.

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Wheel Alignment Services

Regular wheel alignment services will optimize your vehicle performance and promote reduced tire wear, better gas mileage, and safer driving conditions.

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Transmission Diagnostics / Repair / Service

Whether you drive a manual, automatic, or semi-automatic vehicle, our team has the necessary skills and experience to correctly diagnose the problem with your transmission and repair it quickly.

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Induction / Intake System Cleaning / Service

Induction system cleaning service will remove carbon and other deposits to improve your diesel engines throttle response, power, and fuel economy.

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Diesel Engine Oil System Cleaning / Flush

A diesel engine oil flush will help keep the engine clean and the injectors in top notch shape.

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Fuel Injection System Service / Cleaning

Fuel inection system need to be cleaned to give you better gas mileage, increase engine performance, restore a smooth idle and protect from possible future repairs.

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Glow Plug Replacement Service

Glow plug will eventually fail and replacement is not like replacing spark plugs, it can be more difficult and labor intensive.

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Drivetrain (Axle / CV Joint / Driveshaft / Driveline) Repair / Service

Your vehicle’s axle, CV joint, and driveshaft components are integral to the performance and drivability of your vehicle.

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Belts and Hoses

Your vehicle’s belts and hoses play crucial roles in functional operations, and have shorter life spans compared to other components in your car, so it’s important to have them checked regularly.

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Brake System Diagnostics / Service / Repair / Replace

A fully functioning brake system is essential to your safety, the safety of your passengers, and the safety of other drivers on the road.

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Climate Control AC and Heating System Diagnostics / Repair

During an AC diagnostic, our highly-trained technicians will inspect the belts for cracks, the compressor for leaks, the electrical components for connectivity, and the entire system for low pressure.

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Engine Cooling System Diagnostics / Service / Repair

Your vehicle’s differential, primarily responsible for routing and regulating power between wheels, helps you maintain control while you turn at different speeds.

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Differential Repair / Service

Whether your car or truck has four-wheel drive, front wheel drive, or rear wheel drive, your vehicle’s differential will experience heavy wear and tear over time, especially with extreme driving or tougher terrain.

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Electrical & Electronic Diagnostics / Service / Repair

Whether you have a problem with your headlights, turning signals, motor-driven accessory units, electrical wiring, or any other electrical system, you can count on our team to get you back on the road quickly and safely.

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4-Wheel Drive System Diagnostics / Service / Repair

Properly functioning four wheel drive systems allow all four wheels on a vehicle to spin simultaneously, resulting in a safe, smooth, and consistent ride.

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Starting and Charging System Repairs / Serivces / Diagnostics

Your vehicle’s starting and charging systems are complex, and one bad link between them can render the entire electrical system useless.

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Steering and Suspension Diagnostics / Service / Repair

Properly functioning steering and suspension systems maintain comfortable riding conditions and help you maintain control of your vehicle at all times.

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VGT Turbo Service

A VGT (variable geometry turbo) service will help keep the turbo running at its best.

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EGR Cooler System Service / Cleaning

An EGR cooler service will help keep your emission system in top notch shape with minimum break downs.

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Diesel Particulate Filter Service / Cleaning

Diesel engine flushes will result in an increase in compression, due to dissolving, dispersing, and removing carbon around piston ring grooves.

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Major Service – Fuel Filter, Air Filter, Lube Doors / Window / Hinges

We recommend having the commonly neglected major services completed on your vehcile once a year or every ten to twelve thousand miles.

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Minor Service (Oil Change)

An oil change is an easy and inexpensive way to maintain the health of your car or truck.

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HVAC System Service / Cabin Air Filter

Having your vehicles HVAC system serviced will positivly impact the efficiency of the heating and cooling system in your car, not to mention the air quality.

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Automatic Transmission Fluid Service

Over time, transmission fluid picks up dirt and grim and it is important to have a the fluid serviced to prevent severe damage to your transmission.

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Brake Fluid Exchange / Service

Your brake fluid should be clear or at least translucent, if you notice a brown color, it means you should have your fluid flushed.

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AC Refrigerant System Service

Cooling system services will keep your car running at its peak temperature and help avoid costly repairs.

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Power Steering Fluid Exchange / Service

If you notice any difficulty steering your vehicle, it is time to have your power steering fluid checked.

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Timing Belt Replacement

Your vehicles timing belt should be replaced about every five years to avoid engine damage if the belt should break.

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Cooling System Service

Proper auto air conditioning system services will keep you comfortable and safe while in your vehicle.

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Tire Rotation Service

Scheduled tire rotations will give your tire longer tread life, imrove gas mileage, and increase tire performance.

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Shocks / Strut Replacement Service

If your car ride is getting increasingly bumpy or you feel your vehicle pulling in a certain driection it is time to have your shocks and struts checked.

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Clutch Fluid Exchange / Service

Clutch fluid is brake fluid, but it plays an important role in the operation of the clutch because the fluid is stored in the clutch master cylinder.

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Rear Differential Fluid Service

The differential needs to be properly lubricated in order to stay strong and to keep the wheels turning at different speeds, while still providing power to your vehcile.

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Transfer Case Fluid Service

The transfer case fluid should be changed regularly to reduce the chance of any drivability related concerns, this will prevent a future differential replacement.

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Manual Transmission Fluid Service

Manual transmissions use a more standard oil, but still need regular fluid maintenance to extend the life of the transmission.

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Front Differential Fluid Service

Your differential job is to compensate for the differences in wheel speed when turning, so it is important to make sure that the fluid is clean to keep you safe on the road.

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Windshield Wiper Blades

Wiper blades need to be checked regularly, hot air can dry and crack the blades leaving them ineffective when they are needed.

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Battery Connection Service and Replacement

Battery cables and terminals provide the necessary electrical path to transfer the battery power to the entire vehicle, so replacing older cables will provide longer battery life and alternator operation.

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DEQ Checks

Our thorough DEQ checks help ensure your vehicle is properly maintained and your emission control systems comply with EPA regulations.

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No Matter the Model, We've Got You Covered

Ford Diesel Repair
Dodge Diesel Repair
Chevrolet Diesel Repair
GMC Diesel Repair

VW TDI Diesel Repair
Sprinter Diesel Repair
Jeep Liberty Repair
Jeep Repair

RAM Truck Repair
Subaru Repair
And many more!

Quality Auto Repair for Portland OR & Beyond!

Portland OR
Vancouver WA
Oregon City OR
Salem OR
Beaverton OR
Hillsboro OR
Northeast Portland

North Portland
Gresham OR
Clackamas OR
Tigard OR
Tualatin OR
Lake Oswego OR
West Linn OR

Milwaukie OR
Forest Grove OR
Troutdale OR
Camas WA
Longview WA
And surrounding areas!

Get Back on the Road Quickly & Safely

Partner with us and we’ll get right to the root of your vehicle’s problem rather than just treat the symptoms.

Give Us a Call

Talk with one of our service advisors to get your questions answered and set a convenient time to bring your car in for inspection.

Bring Your Car In

Talk with one of our service advisors to get your questions answered and set a convenient time to bring your car in for inspection.

We'll Handle the Rest

Talk with one of our service advisors to get your questions answered and set a convenient time to bring your car in for inspection.

These guys were so amazing! I severely needed an oil change and they got me in right away. They were efficient, kind, and didn’t try to push sales, which I really appreciate. My rating for them is 5/5, for sure!

Brittany W. Facebook Review

AG picked up and delivered my girlfriends car once they changed the oil. They were right on time to pick the car up, they even cover the seat and wear gloves while in your car. I was surprised how much they did during an oil change. During the oil change they even informed me about a light that was burnt out and didn’t even try to upsell me on it like other shops do. I will bring or have my cars picked up and brought to this shop from now on. It was such a easy process!

J.W., Google Review

I took my 2008 Chevy Duramax into AG Automotive when it was having some hard start and engine misfire issues. Turns out I needed new glow plugs and also had some bad wiring issues. AG took care of my truck quickly and even ended up saving me some money off the original estimate. AG stayed in constant communication with me while my truck was there and took care of it quickly and professionally. AG had been recommended to me based on their Diesel expertise and they lived up to their billing. The cost and professionalism were just an added bonus. Highly recommend these guys for Diesel repair and now that I know they also do gas vehicles, I’ll be bringing in my girlfriend’s Jetta from now on. Thanks AG!

Mark M., Yelp Review

AG provides the best truck service and repair we have ever seen… very professional and always gives you the best advice… willing to set a flexible schedule to fit our needs. We will definitely come back and choose AG for our future truck service and repair.

Weilei H., Google Review

I’ve been using AG Diesel since 2012 (4+ years) and they really do superior quality work. From general maintenance, to great advice, and even half an engine rebuild due to a bad head gasket, the parts they choose and the work they do is top notch.

Scott M., Yelp Review

Don’t Second-Guess the Condition of Your Vehicle

Many auto owners struggle to know if the right work was done the right way on their car. As a courtesy, we provide digital vehicle inspections and photos so you can quickly and easily see what our experienced, professional technicians are seeing. Overall, we go the extra mile to help you make informed decisions on the repair and maintenance plan of your vehicle, so you can drive with confidence every time you get behind the wheel.