AdBlue system repairs range from €150-400 for a NOx sensor or an injector, to €600-1,500 for the complete dosing pump, up to over €2,000 for the SCR catalyst. Diagnosis decides which of the three.
Indicative cost by component
| Component | Indicative cost | How often it fails |
|---|---|---|
| NOx sensor | €150-400 | Very frequent |
| AdBlue injector (cleaning or replacement) | €150-400 | Frequent |
| Blocked filter or line | €50-200 | Underrated |
| Dosing pump / tank module | €600-1,500 | Less frequent |
| SCR catalyst | over €2,000 | Rare |
Why not wait for the last start
The system warns with a countdown of remaining starts. When it reaches zero the engine will not restart: the repair costs the same, but you add the tow truck and downtime. Acting at the first messages does not save on the part, it saves on the extras. Symptoms and causes are in faulty AdBlue pump and AdBlue error and power reduction.
Prevention that works
- Use AdBlue complying with ISO 22241 and do not store it for months
- Do not top up from containers used for something else
- Do longer trips so the system works at temperature
- Do not leave urea crystals on the cap and filler neck
Disabling AdBlue
Software disabling of the SCR system is not permitted on the road: it concerns only off-road, competition or export vehicles. On a road vehicle it is repaired and function restored.
How MasterTuning helps
We read the real values of the control unit, not just the code: that is the difference between finding the faulty component and replacing parts by trial and error. After the repair we clear the error and check that it does not come back. Find the nearest centre or contact us.
Are you a workshop or a technician?
If you diagnose and work on SCR systems, or want to start working on ECUs, the tools are in our shop: Flex (OBD, Bench and Boot) and The Genius (stand-alone, with touchscreen), plus Korhex for protected ECUs. If you already have the equipment, you can get the modified files on mastertuningfile.com (credit price list).
AdBlue error: guides by make
Is your problem about a specific make? Read the dedicated guide: Peugeot and Citroën BlueHDi, Opel, Fiat, Mercedes BlueTEC, VAG group. Or the full overview of AdBlue problems by make.
Want a tailored quote? Book a diagnosis at the nearest MasterTuning centre.
Frequently asked questions
How much does it cost to repair the AdBlue system?
From €150-400 for a NOx sensor or injector, to €600-1,500 for the dosing pump. The SCR catalyst exceeds €2,000.
What breaks most often in the AdBlue system?
The downstream NOx sensor and the crystallised injector are by far the most frequent failures.
What happens when the starts run out?
The engine will not restart until the system is repaired and the error cleared in diagnosis: tow costs add to the part.
Does AdBlue from another brand work?
Yes, if it complies with ISO 22241 ("AdBlue" or "AUS 32"). Compliance and freshness matter, not the brand.
