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.
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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.