Ford 6.7 Def Problems – Everything You need to Know

The Ford 6.7 liter diesel engine has been having some serious problems lately. Some owners have reported complete engine failures, while others have had to have their engines rebuilt. There have also been reports of the engine oil level dropping suddenly, and of the check engine light coming on.

All of these problems are very expensive to fix and can cause a lot of downtime for the truck owner.

In this blog post, we’ll take a look at some of the most common Ford 6.7 Def problems and what you can do to resolve them. One of the most common DEF problems is clogged nozzles.

This can happen when DEF crystallizes or solidifies in the nozzle, preventing it from spraying properly. To clean a clogged nozzle, simply remove it and soak it in warm soapy water for a few hours. Once it’s clean, reattach it and you should be good to go.

Another common issue is leaking in the DEF system. These leaks can occur in various places, such as the tank, hoses, or fittings. If you suspect a leak, check all of these areas for signs of moisture or seepage.

Once you’ve located the leak, repair it with fresh sealant or replacement parts as needed. Lastly, sometimes it can go bad. This usually happens due to contamination from other fluids or substances (such as oil).

If your DEF looks cloudy or has chunks floating in it, dispose of it and get fresh fluid from your dealer or retailer.

Ford 6.7 Def Problems

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How to solve Ford 6.7 Def Problems

A Ford 6.7 Def has a problem. We have the solution to any problem you’re having with your truck and we can fix it right away.

Our team of experienced mechanics at 503 Auto Tech will test and diagnose any issues with your vehicle. Let us help make your car run like it should if you’re struggling with engine, transmission, or electrical problems.

Ford-certified mechanics will inspect your car or truck to determine what is wrong and make sure that the repair is done correctly.

503 Auto Tech offers a range of services to suit your car’s general maintenance needs, as well as repairs on a wide variety of makes and models including Honda, Nissan, Toyota, and many more.

6.7 Powerstroke DEF INJ. Diagnosis

If the DEF level will not display or is stuck displaying 99%, you can try removing the DEF sensor, cleaning the threads, and applying a little oil to the sensor.

If this still doesn’t resolve the issue, there may be a problem with the DEF fuel pump.

If the Level is stuck on empty and blinking, this means that you have a low DEF tank. This can happen if you are low on diesel, have too much water, or if there is an air bubble in your DEF tank.

If it happens while driving, it can shut down your injection system until the DEF level reaches above 10%. Once the system resets and power comes back, it will continue to function normally until you run out of fuel.

When you add DEF to your tank, make sure it goes to the bottom. If you have a DEF tank mounted on the roof of your vehicle and it is leaking, DON’T DRIVE WITH DEF ON THE ROOF.

The corrosive effect of the DEF can cause severe damage to your paint. Most car washes will have a wash bay with a power flush or chemical solution that can be used to clean up any leaks before they are allowed near your vehicle’s paint.

6.7 Powerstroke DEF INJ. Diagnosis

What Are Some Common Problems With The Ford 6

0L Powerstroke? The 6.0L Powerstroke engine was introduced in the 2003 model year and used in Ford Super Duty trucks until 2007.

While it was an improvement over the 7.3L Powerstroke in terms of power and fuel economy, it was plagued with reliability issues that led to a number of recalls and service bulletins.

Common problems with the 6.0L Powerstroke include:

1. Coolant leaks:

The 6.0L Powerstroke is prone to leaking coolant from the cylinder head gaskets, intake manifold gaskets, and oil cooler lines. These leaks can lead to engine overheating and serious damage if not repaired promptly.

2. Head gasket failure:

One of the most common problems with the 6.0L Powerstroke is head gasket failure, which can cause coolant or oil leaks, engine overheating, loss of power, and white smoke from the exhaust. Head gasket failures are often caused by excessive turbo boost pressure or cylinder head cracking due to overheating.

 3. Turbocharger failure:

Turbocharger failure is another common problem with the 6.0L Powerstroke, particularly the early production models (2003-2004).

Turbocharger failures can cause loss of power, black smoke from the exhaust, and engine stalling or misfire under load. In extreme cases, turbocharger failure can result in engine fires. 

4. Injector problems:

Injector issues are also common on the 6.0L Powerstroke, especially on early production engines (2003-2004).

Injector problems can cause loss of power, rough idle, increased fuel consumption, and black smoke from the exhaust when under load.

7 Liter Diesel Engine

A 7-liter diesel engine is a type of internal combustion engine. This engine is designed to run on diesel fuel, which is a type of fuel that is derived from crude oil. Diesel engines are typically more efficient than gasoline engines, and they produce fewer emissions.

Diesel engines work by compressing the air inside the cylinders. This compression ignites the fuel, which then burns to create power. The 7-liter diesel engine is a large engine, and it can be found in trucks and buses.

This engine size offers plenty of power and torque, making it ideal for hauling heavy loads. Diesel engines are known for their durability, and they often last longer than gasoline engines. They require less maintenance, and they can handle higher temperatures and pressures than gasoline engines.

If you’re looking for an efficient and powerful engine for your vehicle, consider a 7-liter diesel engine.

7 Liter Diesel Engine Is Having Problems

If your 7-liter diesel engine is having problems, there are a few things you can do to troubleshoot. First, check the oil level and quality. If the oil is low or dirty, it could be causing your engine problems.

Make sure to change the oil and filter if necessary. Next, check all of the fluids in your engine including coolant, power steering, and brake fluids. If any of these fluids are low or dirty, they could be causing your engine problems.

Finally, check for any leaks in your engine. If you find any leaks, repair them as soon as possible.

7 Liter Diesel Engine Is Having Problems

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7 Liter Diesel Engine Is Not Running Properly

If your 7-liter diesel engine is not running properly, there are a few things you can check. First, make sure that there is enough fuel in the tank. If the tank is empty, fill it up and try again.

If the engine still won’t start, check the oil level. If it’s low, add more oil and try again. Finally, if the engine still won’t start, check the battery.

Make sure it’s fully charged and then try starting the engine again.

7 Liter Diesel Engine Has A Problem

If you’re driving a 7-liter diesel engine, you may be having some problems. This is because the 7-liter diesel engine is known to have some issues with its fuel injectors. If your engine is having trouble starting, stalling, or running rough, it could be due to a problem with the fuel injectors.

In order to fix this problem, you’ll need to take your car to a mechanic or dealership that specializes in repairing these types of engines.

How do you reset a DEF fault?

If you have a DEF issue, the first thing you need to do is check the tank. DEF is only accepted in the clear container. If there’s a yellow one in your truck, take it back and get it exchanged.

Next, make sure your DEF tank isn’t overfilled.

If you have a DEF software fault, clear it. This will provide you with a temporary fix, but it won’t resolve the underlying problem. You’ll need to take your truck to the dealer for a full diagnostic to ensure everything is functioning as designed.

There are several ways to clear DEF codes on the 2017-18 F-250 and F-350 Super Duty trucks:

Turn the key on, but do not start or crank the engine.

How do you reset a DEF fault

Where is the DEF sensor located?

The DEF sensor is located on the left side of the fuel tank. It’s a small plastic box with a set of wires coming out of it. It’s behind your battery.

Can I clean my DEF filter myself?

No, the DEF filter is an expensive part and should be replaced periodically by a qualified mechanic.

Why is my DEF light on but the tank is full?

There are several reasons why a DEF fault could be present, but the most common is that you have a defective fuel filter. If you did not install the filter yourself, make sure it’s in proper working order by calling your local Ford or Lincoln dealer.

How much is a DEF sensor?

The DEF sensor on 2017-18 Super Duty trucks usually costs around $300, though that price could vary depending on your location.

How long does a DEF pump last?

For the most part, DEF pumps last around 50,000 to 80,000 miles. However, when it gets old enough that the fluid is no longer flowing through it (replaced around 60,000-65,000 miles), it needs to be replaced.

How do you diagnose a DEF system?

You’ll need a Ford sensor code tool. Make sure you have the right one for your truck because some of them are not cross-compatible.

You can think of it like a computer. You have to put the data into it to tell it what steps to execute in order to solve the problem. Once you clear the fault codes, your system will return to normal operation.

Most people like using a digital version with a computer or laptop because there’s no wire required.

How do you diagnose a DEF system

Does revving clean DPF?

Yes, revving the engine helps clean out carbon in the PDF. However, it’s not a full replacement for a cleaning procedure.

How do you clean a DEF system?

By hot water washing and a lot of it. Typically, 1/3-1/2 of the system needs to be cleaned out. This could require a few gallons, depending on the size of your truck and how dirty it is.


Are there any problems with the Ford PowerStroke diesel?

The most common problems with the 6.0L, 6.4L, and 7.3L Ford PowerStroke diesel engines are problems with the DPF, Glow Plugs, and EGR systems.

Are Ford F-Series diesel engines any good?

Yes. All of the new F-Series diesel engines are excellent and are our top sellers by far. All of our Ford PowerStroke diesel customers love their trucks and tell us all the time how much they enjoy driving them.

What are the most common fault codes on a Ford truck?

The most common fault codes are P0402, P0403, P0404, and P0405. These 4 codes mean that you have a problem with your Glow Plugs and they need to be replaced.

Why is def def so hard to fix on an F350?

The DEF tank on the F350 is mounted up on the roof of the truck and can leak out if you have a roof rack or any other equipment that causes it to get pushed to one side when traveling at high speeds or over bumps.

If you have a leaking DEF tank, take it off the roof, avoid driving through car washes and clean up any leaks immediately.

FORD 6.7 | YOU did WHAT with the EGR


The Ford 6.7 liter diesel engine has been having some problems lately. Some owners have reported issues with the Ford 6.7 Def Problems, while others have had problems with the engine not starting at all.

The cause of these problems is still unknown, but Ford is investigating the matter and working on a fix. In the meantime, owners of affected vehicles should take their vehicles to a Ford dealer for service.

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