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MERCEDES-BENZ GLC NOX SENSOR: TECHNICAL SOLUTIONS AND DIAGNOSTICS

Live Examples Of Errors
What errors usually look like
Check Your Dashboard
Have you ever seen such lights?
If so, it's likely due to an AdBlue EGR, DPF, EKAS- related problems
Also Known As
The most common errors
Exhaust Fluid Reserve!
Refill Exhaust Fluid!
15 Starts Remaining!
Cannot measure fluid level!
Engine Start not possible in *** km (mi)!
These are the most common errors you may see on your dashboard
ANY QUESTIONS? WE’RE HERE TO PROVIDE answers — JUST ASK!

A stored dashboard warning can turn normal daily use into downtime faster than most owners expect. On this page, we focus on GLC NOx sensor cases and explain how our handheld solution helps clear the active dashboard fault while the original hardware stays in place. This is written for owners who want to keep Your Vehicle and car in service when a sensor issue remains active and the Engine Light does not go away. For many Mercedes-Benz owners, that is the first practical step before ordering extra parts. A stored NOx message can follow the first sensor issue and keep the dashboard warning active.

When this fault becomes the main problem

Our company supplies one direct tool for Mercedes-Benz vehicles where the Nitrogen Oxide NOx Sensor path keeps the warning stored. In practical use, owners search for phrases such as Nitrogen Oxide Sensor for Mercedes, Mercedes NOx Sensor, Mercedes-Benz NOx Sensor, correct sensor, upstream sensor, and sensor downstream. The main goal is clear: restore normal use of your vehicle without immediate replacement of the original part. This also helps owners avoid trial-and-error parts changes when the same NOx warning stays active. In some cases, one NOx sensor stays stored while another NOx value keeps the NOx path active.

This page stays narrow by design. We do not sell mixed products, accessories, or unrelated hardware from another brand. We provide one focused electronic solution only for the GLC model when the warning remains active after restart. This helps when NOx logic remains stored and NOx adaptation does not reset.

How owners usually describe the issue

Search language varies, but the intent stays the same. Some owners say the light came on and stayed on. Others describe an Engine Light, a sensor issue, or LC NOx Sensor malfunction when they try to find the real cause. In many cases, the stored fault stays active even after a sensor change, even after checking the catalytic converter area, or even after comparing one sensor with other sensors listed by price or brand. Sometimes the warning returns with reduced power, and the owner starts treating the car as unreliable for normal use.

The owner may see one sensor warning, then another sensor warning, while NOx history and NOx status remain active. That is why correct matching matters before any hardware change. In some Mercedes-Benz cases, the engine warning appears again after restart, the NOx message remains, and the sensor history shows repeated NOx activity over several drive cycles. Search overlap can also come from navigation menus, steering controls, or electric warning history, but those do not change the actual fault path.

  • Used when the dashboard light stays active after restart
  • Relevant when the owner wants to keep the original part installed
  • Focused on one GLC NOx sensor warning path only

What our solution does

The tool connects through OBD and applies the required script to clear the stored dashboard restriction. It does not require immediate replacement of the original sensor. That matters when the owner wants a direct answer instead of trial-and-error parts changes. For many Benz owners, this is the most practical way to restore normal use while the original sensor hardware remains in place. It also helps keep the car available without pushing the owner into unnecessary parts replacement too early.

We keep this page technical and specific. It is not a store page for broad accessories, not a catalog of mixed products, and not a page for unrelated systems. It is a focused page for one model, one warning path, and one direct result tied to engine management. That matters when the same NOx fault returns and the NOx path still points to the original sensor.

Before ordering

To prepare the correct setup, we may ask for the exact model year and the warning text shown on the cluster. That helps us match the correct sensor path and separate one stored fault from another. Owners often compare Genuine Mercedes references, genuine part numbers, and the price of a new sensor before deciding what to do next. Our solution is intended for the case where the owner needs the vehicle and car back in service without immediate hardware replacement. For Mercedes-Benz fitment, that is often the cleanest path when the same NOx fault remains stored and Mercedes-Benz owners want a direct answer.

Before ordering, we can compare NOx data, NOx cycles, NOx memory, and one sensor path so another sensor path is not confused with it. We also look at whether a final NOx warning returned and whether another NOx record stayed stored after restart. That helps separate one sensor history from another and keeps the matching accurate.

  • No bundled accessories or unrelated products
  • No need to replace hardware as the first step
  • One direct solution for a stored GLC NOx sensor dashboard fault
Question by Brandon • Published on April 20, 2026

How do I clear a NOx sensor warning on a Mercedes GLC?

My Mercedes GLC keeps showing a NOx sensor warning and the engine light stays on, and I do not want to keep buying sensors or changing parts if the car still needs to be used every day. Is there a proper way to clear the stored dashboard fault and keep driving while the original sensor stays in place for now?

Answer by OBDtune Team

Price: from $459
Compatibility: Mercedes Vehicles All Types
Worldwide Delivery

For Mercedes GLC NOx sensor fault cases, our handheld OBD module is often the most practical solution because it clears the stored dashboard restriction without making immediate sensor replacement the first step. That helps keep the vehicle usable, reduce downtime, and remove the active warning while the original hardware remains installed.

What is OBD module
Encode your Sprinter with hand-held module to fix DEF issues forever
We have developed the module, looks like a simple OBD plug.
It can program ECU with maximum ease for everyone!
Universal solution
No Downtime
Ready To Go!
Easy To Use
Installing our module is as easy as switching on a kettle: just plug it in and wait for the download to finish.
No special knowledge required!
Best Solution
2026
Check out our benefits!
Installation takes just 3 MINS
01
Plug in the tool to the OBD diagnostic
There is a diagnostic connector in every car and access to it is simple and convenient. You simply have to insert our module into this slot.
02
CONFIRM SETTINGS ON THE COMAND SCREEN
The screen will allow you to select one of several scripts. Use the <> buttons to switch between them and the * button to confirm the selection.
03
Wait to be loaded​
After selecting the script, the installation process will start. It takes from a few seconds to 10 minutes depending on the script. Just follow the instructions on the screen.
04
KEEP DRIVING WITHOUT LIMITS
When the installation is complete, remove the module, start the engine and make sure there are no more errors.
EASY SETUP WITH ALL MEDIA SYSTEMS
Watch these video instructions for installing the module and see how easy it is!

WE OFFER 3 SOLUTIONS

Our module will solve the problem of your vehicle being idle or spending extra money on repairs and finding a qualified mechanic.
Choose the right solution and install it yourself in a few minutes!

SCR ADBLUE / DEF DELETE

SCR total delete – no longer necessary to repair the SCR system and refill the AdBlue fluid
Whats include?
Completely remove Check Engine error
Completely remove 0 Remaining Starts error
Completely remove Starts idle error
Completely remove Check AdBlue error
Ability to roll back to factory settings
Maintains the dealer warranty
Easy pass emissions test ability
$
699
one-time payment
Off-road use only - about usage

ADBLUE (DEF) COUNTER RESET

Temporary solution – start the engine and drive to workshop without limitations but the SCR still needs to be repaired
Whats include?
SCR system continues to work
Ability to reset engine starts counter as many times as needed
Absolutely legal
Maintains the dealer warranty
$
459
one-time payment

What you'll run into without our module

You might not see them coming, but additional issues are often part of the package. It's the heads-up every customer needs.
Why better choose package deal
Just a quick heads-up on the headaches our solutions will save you from. Through years of experience, we've nailed down our customers' top issues and crafted the perfect fix for each. A package deal – it's an all-in-one solution.
Exhaust Gas Recirculation or EGR
Soot builds up on the valve, which can interfere with its operation and cause it to fail. Repairs are expensive and difficult. And most often the repair period takes a long time.
AVERAGE COST​
How much you'll save
2000
+
Selective Catalytic Reduction or SCR
The SCR system consists of a large number of components that can fail. The most expensive breakdown is the DEF level sensor in the tank, as it will require replacing the tank entirely.
AVERAGE COST​
How much you'll save
3000
+
Swirl Flaps in the Intake Manifold
Also, soot builds up in the intake manifold, which will interfere with the operation of the flaps. In this case, the entire exhaust manifold will have to be replaced, which is very expensive.
AVERAGE COST​
How much you'll save
3500
+
Diesel Particulate Filter or DPF
Remove the DPF when it is clogged and only if you don't want to buy a new one, because it is very expensive. In that case we could add coding additionally so you can remove the DPF when the time comes.
AVERAGE COST​
How much you'll save
5000
+
Tons of issues out there, but we've got one solid fix ready to go!
Get some additional features for your solution!
ADDITIONAL OPTION ECU TUNE STAGE 1
We install extra firmware to cut fuel use and save you 10% on gas. Pretty cool, right?
Dyno & Track tested performance results:
Engine: OM651 2,1L. Gain: +30 HP, +44 ft-lb
Engine: OM642 3,0L. Gain: +40HP, +49 ft-lb
ALREADY INCLUDED IN THE PACKAGE DEAL
SEPARATE CODING OF DPF DELETE OPTION
With this coding, you’ll have the option to remove the DPF from the system.
We advise only removing it if it's fully clogged and replacement or removal is required. Removing it early has no real benefit, so it’s best to wait until it’s truly necessary.
$
200
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Delivery Information
We offer worldwide shipping through our partnerships with FedEx and DHL Express, ensuring your package is dispatched swiftly and reaches you as quickly as possible.

We ship orders as quickly as possible. Most orders are dispatched the next business day, usually in the morning.
Delivery Terms
FedEx Standard
In average requires 5-10 days
FedEx Priority
Deliver the parcel for 3-5 days
DHL Express
Typically delivery takes 3-5 days
Additional options
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