Freightliner Parts

Freightliner Parts for Sale

This page lists the Freightliner parts we sell for the Cascadia, Columbia and Century Class trucks. Most are lighting parts: halogen and LED headlight assemblies and LED fog lights. We also stock an engine air filter and a heavy-duty starter. Every part shown above can be ordered online, and each product page lists the truck model, years, side and part number.

Headlights on a semi truck take a beating. Stones from the road crack the lenses, years of sun turn them yellow and cloudy, and vibration breaks the mounting tabs. Dim or damaged headlights are a safety issue on night runs and a common reason for failing a roadside inspection. Replacing the whole assembly is often quicker than repairing a damaged housing.

Below are the parts with their specs, how to choose the right headlight for your truck, fitting and aiming tips, maintenance advice and answers to frequent questions.

Freightliner Parts in Stock

Headlights and Fog Lights

Engine and Starting

We also have a separate Freightliner headlights page, and more truck parts on commercial truck parts and diesel truck parts.

Choosing the Right Freightliner Headlight

  1. Model and year. The Columbia (2004-2017) and the new-generation Cascadia (2018 and later) use completely different headlights. The older Cascadia (2008-2017) is different again.
  2. Side. Headlights are side-specific. Driver side means the left side on a left-hand drive truck. Check whether you need one side or a pair.
  3. Halogen or LED. LED headlights give a whiter light, use less power and last longer. Halogen headlights are cheaper and bulbs are easy to replace. Check that your wiring and connectors suit the type you choose.
  4. Housing finish. Black and chrome housings are available for some models. This is a matter of looks.
  5. Bulbs included or not. Some halogen assemblies include bulbs and some do not. Check the product page.
  6. Road approval. In many countries, headlights must carry a specific approval mark for road use, such as DOT/SAE in North America or ECE in many other regions. Check the requirements where your truck is registered.

Fitting and Aiming Headlights

On the Cascadia and Columbia, the headlight assembly is reached by tilting the hood forward. The general steps:

  1. Park on level ground, set the brakes and tilt the hood.
  2. Unplug the headlight connectors and any marker light wiring.
  3. Remove the mounting bolts or clips and lift the old assembly out.
  4. Fit the new assembly, tighten the mounts evenly and reconnect the wiring.
  5. Test low beam, high beam, marker lights and turn signals before closing the hood.
  6. Aim the headlights. Park about 7.5 m (25 feet) from a wall on level ground, mark the centre of each lamp on the wall, and adjust so the top of the low beam cut-off sits just below the centre height. Follow the specification for your truck and country.

Correct aim matters. Headlights aimed too high dazzle oncoming drivers, and too low shortens your view of the road.

For background on the company and its trucks, the Freightliner Trucks article on Wikipedia covers the model history.

Air Filters and Starters

A semi truck engine moves a huge amount of air, and a clogged filter costs power and fuel. Change the filter on the interval in your service schedule, or sooner in dusty conditions, and check the restriction indicator if your truck has one. A heavy-duty starter like the 39MT is built for large diesel engines. If the truck cranks slowly, clicks or grinds, check the batteries and cables first, then the starter. See engine air filters and starter motors.

Keeping Truck Lights in Good Shape

  • Clean the lenses regularly. Road film and bugs can cut light output a lot.
  • Check all lights in your pre-trip inspection.
  • Look for condensation inside the lens. A little that clears quickly is normal, but standing water means the seal has failed.
  • Use dielectric grease on connectors to stop corrosion.

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Ordering, Delivery and Returns

You can order these Freightliner parts directly from this page. Delivery options and times for your country appear at checkout and on our shipping page. If a part does not match its listing, our returns page and warranty page explain what to do.

Freightliner Parts FAQ

Do Columbia headlights fit the Cascadia?

No. The Columbia and Cascadia have different front ends and headlights.

Can I switch from halogen to LED headlights?

Usually yes with a plug-in LED assembly made for your truck. Check the connector and any wiring notes on the product page.

Should I replace headlights in pairs?

Not required, but a new lamp next to an old yellowed one gives uneven light and looks mismatched. Many drivers replace both.

How do I know which starter my truck needs?

Check the label on your old starter for the model and tooth count, and compare with the listing. Ours is a 12V 11-tooth 39MT style.

Do you deliver Freightliner parts to my country?

Countries and delivery costs are shown at checkout. See our shipping page.

Cascadia, Columbia and Century: Which Freightliner Do You Have?

Freightliner, part of Daimler Truck, builds some of the most common Class 8 trucks on North American roads. For lighting and body parts, the model and generation matter more than the year alone. The Columbia was built in the 2000s and into the 2010s, and our Columbia halogen headlight and Columbia LED headlights cover 2004-2017 trucks. The Century Class was built alongside it. The first Cascadia arrived in the late 2000s, and the new-generation Cascadia, with a redesigned front end and different headlights, arrived for 2018. That is why we list Cascadia headlights by generation, such as the 2018-and-newer Cascadia driver side headlight and the 2018-2021 Cascadia passenger halogen headlight. Before ordering, check your truck's model, year and the shape of the existing headlight against our photos.

Halogen, LED and Bulb-Included Assemblies

Freightliner headlights come in several forms. Factory-style halogen assemblies take replaceable bulbs. LED assemblies have built-in light sources and no bulbs to change. Some assemblies come with bulbs fitted, like the pair of Freightliner headlights with bulbs. When you switch from halogen to LED, check that the connector matches, that the LED assembly is approved for road use where you drive, and that it does not trigger a bulb-out warning on the dash. Some trucks need a resistor or a setting change in the body controller for LED lights.

Fog Lights

Fog lights mount low on the bumper and throw a wide, flat beam that lights the road edges in fog, heavy rain and snow without lighting up the fog in front of the driver's eyes. Our Cascadia LED fog lights are a chrome projector pair for 2018-2024 trucks. Because they sit low, fog lights take hits from stones and road salt, so check them during each pre-trip inspection and replace a cracked lens before water gets inside.

Air Filters for Heavy-Duty Engines

A heavy-duty diesel engine moves a huge volume of air, and dust is the biggest threat to its life. Freightliner trucks use large radial-seal or similar air filter elements. Our heavy-duty truck air filter LAF4816 / AF25247 fits many Freightliner, Kenworth and Peterbilt trucks. Most trucks have an air filter restriction gauge or indicator that shows when the filter needs changing; replace the filter when it reaches the limit, or at the interval your fleet uses, rather than tapping it clean. Always check that the seal is clean and seated, because a leaking seal lets dust straight into the engine.

Starters for Heavy-Duty Engines

Heavy diesel engines need powerful starters. The Delco 39MT is a common heavy-duty starter used on many Freightliner trucks and on Caterpillar and Cummins engines. Our Delco 39MT 12V 11-tooth starter lists its tooth count and mounting so you can match it to your engine and flywheel. Before replacing a starter, check the batteries, the cables and every ground connection, because voltage drop in a corroded cable is a common cause of slow cranking on trucks. Clean and tighten the terminals and the starter connections when you fit the new unit.

Pre-Trip Lighting Checks

Most commercial driving rules require a daily pre-trip inspection that includes lights. Walk around the truck with the lights on and check:

  • Low and high beam headlights on both sides.
  • Fog lights, if fitted.
  • Turn signals, hazards and side markers.
  • Clearance and identification lights.
  • Brake lights and tail lights on the tractor and trailer.

A failed light is one of the most common reasons for a roadside inspection violation, so fixing it early saves time and fines.

Headlight Aim After Replacement

Truck headlights sit high, so a badly aimed lamp can dazzle other drivers or leave the road dark. After replacing a headlight, park the truck on level ground facing a wall or garage door, and aim the beams using the adjusters, following the procedure in your service manual. Many workshops have a headlight aiming tool that makes this quick.

Ordering for a Fleet

If you run several trucks, match part numbers across the fleet, because trucks built in different years or plants can use different parts even when they look the same. We list OE and interchange numbers wherever the supplier provides them. For bulk orders or hard-to-find parts, contact us through the request a part page. See also our truck and commercial parts and headlights collections.

Freightliner Vocational and Medium-Duty Trucks

Besides its long-haul Cascadia and Columbia, Freightliner builds the M2 106 and M2 112 medium-duty and vocational trucks, the 108SD and 114SD severe-duty trucks, and the Coronado and 122SD heavy-haul models. Each uses its own headlights, grilles and body parts. The M2 is especially common in delivery, utility and municipal fleets, and its headlights are frequent replacement items because of the stop-start, urban work it does. If you run one of these trucks, match the part number on your current lamp, since our listings are organised by model and year.

Detroit, Cummins and Mercedes Engines

Freightliner trucks have used several engine families over the years, including Detroit Diesel engines such as the Series 60 and the DD13, DD15 and DD16, Cummins engines like the ISX and X15, and Mercedes-Benz engines in some models. Engine service parts, such as filters, sensors and starters, depend on the engine, not the truck model. Our Delco 39MT starter lists Caterpillar and Cummins applications along with Freightliner, so check your engine make and model before ordering. You can usually find the engine details on a plate or sticker on the valve cover or engine block.

Electrical Systems on Freightliner Trucks

Modern Freightliner trucks use multiplexed electrical systems, where control modules switch the lights and other circuits based on signals from the dash switches. This means a lighting fault can sometimes be caused by a module setting or a failed output rather than the lamp itself. If a new headlight does not work, check the fuses, the connector and the ground first, then have the system scanned for fault codes. When fitting LED lights, some trucks need the lighting module set for LED loads so they do not show a lamp-out warning.

Batteries, Cables and Cranking

Heavy trucks use several batteries connected together to provide enough cranking power. One weak battery drags the others down. When starting gets slow, test each battery separately, clean every terminal and cable end, and check the main ground cables to the frame and engine. Voltage drop testing with a multimeter while cranking shows whether a cable or connection is losing power. Replace corroded cables, because they cause many starter failures. Fit new starters with clean, tight connections and the correct cable size.

Air Filtration in Dusty Conditions

Trucks working on construction sites, farms or unpaved roads take in far more dust than highway trucks. Check the air filter restriction indicator often, inspect the intake for cracks or loose clamps that could let unfiltered air in, and replace the filter when it reaches the limit. Never tap or blow out a primary filter element to clean it, because this can create tiny tears that let dust through. A pre-cleaner or a safety element adds protection in very dusty work.

More Questions About Freightliner Parts

How do I tell a first-generation Cascadia from the new Cascadia?

The new-generation Cascadia from 2018 has a redesigned front end with different headlight shapes. Compare your headlights with our photos, or check the model year on the VIN.

Are LED headlights legal on my Freightliner?

LED headlights must be approved for road use in your country or state. Check the markings on the lamp and your local rules.

Will the heavy-duty air filter fit my truck?

Our LAF4816 / AF25247 filter fits many Freightliner, Kenworth and Peterbilt applications. Compare the part number and dimensions with your current filter.

Do you sell parts for the M2 106?

We add Freightliner parts as we source them. Send us your part number and we will check.

How often should I aim my headlights?

Check the aim after replacing a headlight, after front-end or cab suspension work, and whenever the beam looks wrong at night.

Delivery for Fleets and Owner-Operators

We deliver truck parts to many countries. Delivery options and costs appear at checkout and on our shipping page. For multiple units or fleet orders, contact us through our contact page.

Choosing Between Single Headlights and Pairs for Your Freightliner

If only one headlight on your Freightliner is damaged, a single replacement, like our Columbia driver side headlight or the Cascadia driver and passenger side lamps, is the economical choice. If both lamps are old and faded, a pair gives matched light output and appearance, which makes night driving less tiring and looks better on the truck. Our pair of Freightliner headlights with bulbs is supplied ready to fit. Fleet operators often replace both sides at once to reduce the chance of a second roadside failure soon after the first.

Downtime and Spare Parts

For a working truck, downtime costs money. Keeping a spare headlight bulb, an air filter and common fuses in the shop or the truck can turn a breakdown into a quick fix. For fleets, tracking which parts fail most often across your trucks helps you keep the right spares on hand.

Matching Housings: Black or Chrome

Freightliner headlights come with black or chrome housings depending on the trim. Black housings suit modern fleet trucks, while chrome suits owner-operators who like a bright finish. Both perform the same; the choice is about appearance. Keep both sides matching.

Inspection After Fitting

After fitting a new headlight, check that the lamp is securely mounted, the connector is fully clipped in, both beams work, the dash shows no warnings, and the beam is aimed correctly. Recheck the mounting after the first long trip, because vibration can settle the lamp.

Freightliner Fog Light Tips

Fog lights help in fog, heavy rain and snow, but they should be used only when visibility is poor, because they can dazzle other drivers in clear conditions. Many regions restrict fog light use to poor-visibility conditions. On the Cascadia, the fog lights sit in the bumper and are exposed to stones and road spray, so inspect them during pre-trip checks. When replacing them, use the correct mounting brackets and aim them low, following the service manual.

Replacing the Air Filter Correctly

  • Shut off the engine and open the air cleaner housing.
  • Remove the old filter carefully so dust does not fall into the clean side of the housing.
  • Wipe the inside of the housing with a damp cloth, keeping dirt away from the outlet.
  • Check the sealing surface for damage.
  • Fit the new filter, making sure it seats evenly all the way round.
  • Close the housing, then reset the restriction indicator if fitted.

A filter that is not seated properly lets unfiltered air into the engine, which can cause serious wear. Take a moment to check the seal.

Starter Replacement on Heavy Trucks

Heavy-duty starters are heavy, so support the starter properly when removing and fitting it. Disconnect the batteries first, label the cables, and clean the mounting face and the cable terminals before fitting the new starter. Tighten the mounting bolts and cable nuts to specification. After fitting, check for smooth engagement and listen for grinding, which can mean a worn flywheel ring gear.

Freightliner Parts Ordering Checklist

  • Model: Cascadia, Columbia, Century, Coronado, M2 or other.
  • Model year and, for the Cascadia, whether it is the first or the new generation.
  • Halogen or LED lighting, and black or chrome housing.
  • Engine make and model for engine-related parts.
  • The part number on your current part, such as A06-51041-000 or A6601512005.

These details make it easy to match our listings. For fleet orders or anything we do not list, send the details to us through our request a part page.

Keeping Freightliner Trucks Earning

Every hour a truck is off the road costs money. Good lighting, clean air filters and a reliable starter are simple ways to avoid avoidable downtime. Our Freightliner range focuses on these common replacement parts, with clear fitment so you can order with confidence.

Each Freightliner part on this page lists its model, year range and part numbers, so you can compare it with the part on your truck. We deliver to many countries, with options shown at checkout, and our returns page explains what to do if anything is wrong.

For multiple trucks or regular fleet orders, contact us through our contact page to discuss your needs.