NOx delete

What is a NOx sensor delete in the Mochester App?

NOx sensor deletes in Mochester App (M4 App) are designed to remove codes for malfunctions of NOx sensors, derates, warning lights, and performance restriction. Truck owners commonly use it when repeated sensor failures lead to costly repairs, SCR system faults, reduced engine performance, or unexpected downtime.

The development of engine building technologies and fuel injection methods have led to an increase in the combustion temperature, which, in turn, has led to an increase in the formation of nitrogen oxides beyond the permissible limits. To comply with strict environmental regulations, car manufacturers install the SCR, DPF systems and NOX sensors in the engine system of the truck. These components work together to capture, measure and convert NOX gases into less harmful emissions, ensuring that trucks comply with environmental standards. However, in case of errors in the operation of the NOX sensor, you will certainly encounter problems in the operation of your truck. Our experts have developed the Mochester App (M4 App), which can help you to solve the problem of removing truck NOx sensor errors without visiting a dealership or tuning studio and paying a lot of money for the maintenance of your truck. The Mochester App gives you the opportunity to customize your truck yourself!

The NOX sensor operation principle in diesel trucks, buses or CE

The NOx sensor not only monitors the level of nitrogen oxides released into the air, but also plays an important role in its control using the selective catalytic reduction (SCR) system in diesel vehicles.

The NOx sensor is a key part of this system, which also includes the SCR catalyst, diesel particulate filter (DPF) and turbocharger. If the truck NOx sensor detects the release of too many NOx gases, it sends this information to the SCR system, which then adjusts the output signal to a level relevant with emission standards, which helps in accurately calibrating the urea injection volume to effectively reduce NOX emissions. Besides, the truck NOX sensor is capable of measuring oxygen (O2) levels.

Eliminating the NOX sensor can address the following concerns:

• Reduce the costs associated with sensor maintenance and replacement.

• There's no risk of sensor-related malfunctions impacting engine performance.

• Without the constraints of the NOx sensor parameters regulations, trucks can run more freely, and performance can be run more optimally.

• With NOx sensors bypassed, there is one less part to check and can significantly reduce the time spent maintaining the vehicle.

Advantages of switching off NOX sensors

• Reduction of fuel consumption

• No reduction in performance or complete engine shutdown

• No engine malfunction errors.

Disadvantages of switching on NOx sensors

• Limited service life: The NOx sensors in your truck will eventually NOT work, resulting in complications with teh truck's engine performance.

• Malfunction detection: If a NOx sensor stops working or delivers results outside of the expected range, a malfunction will be noted on the ECU.

• Engine performance problems: A malfunctioning NOx sensor can cause various engine performance issues, affecting the overall operation of the vehicle.

• Emergency mode activation: The ECU may enter the truck into limited functionality and performance emergency mode if the ECU detects an NOx sensor malfunction.

How does the NOx sensor work?

A NOx sensor includes a Nernst element where current passes through. It adjusts the air/fuel ratio to λ=1. The second element, usually made of ceramics with a layer of rhodium, breaks down nitrogen oxides into nitrogen and oxygen. The NOx controller, usually located close to the NOx sensor, calculates the level of nitrogen oxides present in the exhaust gases and sends this data to the SCR controller. The SCR controller then regulates the amount of diesel exhaust fluid injected into the SCR catalyst, which in turn converts excess nitrogen oxides into water and nitrogen.

FAQ

Will the NOx sensor derate a truck?

When a NOx sensor fails, you may experience high DEF consumption, poor fuel economy, failed emissions tests and even engine derate. This is because diesel systems have a high emissions standard, due to them having the ability to send soot and heavy particles into the atmosphere as well as hydrocarbons 

Is the truck NOx sensor connected to the DPF?

The NOx sensor is a key part of this system, which also includes the SCR catalyst, diesel particulate filter (DPF) and turbocharging.

How long do NOx sensors last?

NOx sensor service life is generally considered to be between 100,000 and 150,000 miles, and is affected by the operating conditions of the engine.

How many NOx sensors are installed in the truck?

Most engines are equipped with two NOx sensors: an input sensor and an output sensor. Common causes of malfunction include soot accumulation on the sensor, water entering the engine control unit and/or cable damage, which causes the engine check indicator to light illuminate.

What is a NOx sensor on a diesel truck?

A NOx sensor tracks nitrogen oxide (NOx) emissions in the exhaust and relays information to the SCR system and the engine ECU. This is done for the proper management of DEF dosing in order to comply with emissions regulations.

What happens when a NOx sensor fails?

Failed NOx sensors can bring warning lights, SCR failures, DEF errors, higher fuel burn, engine derates, and lower performance to the vehicle.

Can a bad NOx sensor cause a derate?

Yes. On many modern diesel trucks, a faulty NOx sensor can trigger emissions-related derates that reduce engine power and vehicle speed until the problem is corrected.

Can a NOx sensor cause DEF system fault codes?

Absolutely, issues with a NOx sensor generally activate DEF warnings, SCR efficiency faults, and other emissions-related DTCs because of the sensor’s function in SCR and DEF.

How many NOx sensors does a truck have?

Two NOx sensors are typically used in modern diesel engines, an upstream sensor and a downstream sensor, used in conjunction with the SCR catalyst to allow the ECU to analyze the efficiency of the SCR and the performance of the diesel emissions.

Can a faulty NOx sensor affect fuel economy?

It is possible that a faulty NOx sensor can disrupt your vehicle's Diesel Exhaust Fluid dispensing, malfunction emissions systems, and can result in decreased fuel economy.

What fault codes are commonly associated with NOx sensor failures?

Common codes include P220013, NOx sensor communication faults, SCR efficiency codes such as P20EE00, and various ACM-related emissions faults depending on the truck manufacturer.

How often do NOx sensors fail?

NOx sensors should be considered as maintenance parts. Based on fuel quality and other environmental factors, customers will likely have to replace their NOx sensors between 100,000 to 150,000 miles.

Can a NOx sensor problem trigger SCR system faults?

Yes. Because the SCR system depends on the NOx sensor, a faulty NOx sensor can generate SCR performance problems, DEF injection issues, and faults with the SCR catalyst.

Can Mochester App help with NOx sensor-related issues?

The Mochester App (M4 App) does have solutions to support NOx sensor faults, emissions-system diagnostics, ECU reprogramming, and other truck tuning services based on the vehicle’s VIN or chassis number.