What is a Qls sensor?

The commercial vehicle industry is experiencing unprecedented supply shortages on some necessary components. One such component is the DEF Quality Level Sensor (QLS). Due to this shortage, trucks experiencing a QLS failure may not have a new sensor available for repair.

How much does it cost to replace a DEF sensor?

Ongoing shortages of replacement parts for failed diesel exhaust fluid quality sensors are believed to be causing thousands of trucks nationwide to be disabled and parked. The sensors, which measure the quality and level of diesel exhaust fluid (DEF) in the tank, normally retail for roughly $300.

Where is the DEF quality sensor located?

A DEF quality sensor is mounted on the side of the DEF tank. This sensor detects the Urea concentration in the DEF to confirm it is acceptable for effective dosing (approximately 32.5% Urea).

Why is there a shortage of DEF sensors?

The global microchip shortage, exacerbated by the COVID pandemic supply chain disruptions, has resulted in a shortage of Diesel Exhaust Fluid (DEF) sensors. These sensors are required on heavy-duty diesel vehicles to ensure that the emissions controls needed to meet clean air standards are in place and working.

How many sensors does a DEF system have?

First, Diesel Engine Fluid (DEF) sensors are 3 sensors put into 1 apparatus. The DEF level, quality, and temperature are all read via the DEF sensor. For most tractors they are also the source for derate messages these days.

QLS Sensor Production at NewStream - Keep North America Running

Can DEF system be bypassed?

If you're thinking of bypassing any of your diesel's emission controls, remember that that it's highly illegal and the fines can be steep. The chances of getting caught may be low, but the consequences are costly.

Can you pee in your DEF tank?

Please do not urinate in your DEF tank, the SCR system will be damaged and it will cost thousands of dollars to repair. Here at Transliquid Technologies we specialize in providing the best quality of Diesel Exhaust Fluid.

What happens if you run a diesel without DEF?

If you ignore the DEF warning the truck will cease to work. Some diesel engine manufacturers allow the engine to go into reduced power mode so the truck can “limp home” or limit the number of times you can turn the engine over. At some point though the diesel engine will not start.

How often should a DEF filter be changed?

Our recommendation? Change the filter at least every 3 years. If you are putting more than 35k miles on a year, try to have it done every 100k miles.

Can low DEF cause check engine light?

A check engine light may be triggered even if your diesel exhaust fluids are low. There are many fluid fill-ups that need to be replaced, so that's a quick fix.

What causes DEF system failure?

Dirt / Metal Contamination: Contaminated DEF can cause abrasion of the DEF pump. Dirt, rust or tank scale can occur with improper of DEF storage or handling (e.g. res-using disposable DEF containers). UREA Concentration (Dilution): Diluted DEF (too much water) reduces its NOx neutralization effectiveness.

What is a DEF sensor?

The DEF level sensor, which is part of the DEF sending unit, measures the level of fluid remaining in the DEF tank. When the liquid level is low, the DEF level sensor sends a signal to the vehicle's ECU which then triggers the warning light on the gauges or panel.

What happens if you put diesel fuel in a DEF tank?

However, a small number of cases have been reported where diesel has been put in the DEF tank. Diesel is less dense than DEF and will float on top of the DEF in the tank, but even small amounts of diesel can damage your SCR system and we recommend that you contact your dealer immediately and do not drive the vehicle.

Is Blue DEF cow urine?

Contrary to popular myth, cow and bat urine and DEF are not a thing. The urea used in the manufacture of DEF is synthetically derived from ammonia and carbon dioxide, and urea production plants are often adjacent to other sites where ammonia is produced, such as coal and natural gas refineries.

What can you use instead of DEF fluid?

DEF is urea or otherwise known as aqueous ammonia. Windshield washer fluid that contains ammonia will do in a pinch.

What happens if I delete my DEF system?

DEF Delete

Just like the DPF, the system will clear out excess soot by going into a regen cycle and using your vehicle's fuel to burn off and blow out the soot. The DEF can also reduce performance and fuel efficiency but can also cause issues with the system freezing up.

Can you delete DEF on a Duramax?

A DEF Delete Service for your Cummins, Duramax, or Powerstroke diesel engine from Revolution Motors will remove this system so your truck is running at peak efficiency and performance. Trucks with the DEF delete install can improve fuel efficiency by up to 30%.

Can you take DEF off a truck?

Myth #1 – Deleting or Tuning a Truck is Legal

There is no way around this; it is 100% illegal to tamper with or modify the emission system on your truck in any way. It isn't a state or local law (although those exist, as well), but Federal law.

Why is my DEF light blinking?

Flashing DEF Lamp and Solid Check Engine Lamp Indicates that DEF level is critically low, incorrect DEF type or an SCR system issue for more than five hours. Driver will experience a severe loss of engine power.

Should I keep my DEF tank full?

Because it's 2/3 water, it begins to turn slushy at 12 degrees Fahrenheit and will freeze solid. One thing to keep in mind is DEF will expand when frozen, so it's best not to fill containers completely full to avoid damage to them. After it has been frozen, DEF can be thawed and used with no issues.

What is the shelf life of DEF?

The typical shelf life of Diesel Exhaust Fluid (DEF) is usually 2 years. However, to help maximize your shelf life it's recommended to store it between 68°F and 23°F (20°C and -5°C).