The parts that fail most often
Drifting NOx sensors, a crystallised or leaking injector, loss of pump pressure, tank heating, wiring and, at the expensive end, a degraded SCR catalyst.
SCR · NOx · injector · pump · diagnosis
AdBlue system faults and repair
How SCR works, the AdBlue components that fail most often, why faults develop and realistic sensor, injector and catalyst costs.
SCR · NOx · injector · pump · diagnosis
Understanding the SCR chain before replacing expensive parts.
The AdBlue system doses urea solution into the exhaust so the SCR catalyst can reduce nitrogen oxides. A no-start countdown does not automatically prove that the tank is defective: we read pressure, dosing, temperature, quality and NOx signals before deciding.
Why faults develop
Evaporation leaves urea crystals around the injector; contaminated fluid, long storage, thermal cycles and incorrect dosing make it worse. A bad NOx sensor can also condemn healthy parts through the wrong diagnosis.
How we diagnose it
We compare fault codes with pressure, consumption, spray pattern, temperatures and readings before and after the SCR. Replacing a complete tank because of one dashboard message is a gamble, not diagnosis.
Typical repair costs
In Spain, a NOx sensor commonly totals €250–€500, an injector €200–€400 and an SCR catalyst €700–€1,800. A typical complete independent repair may sit around €500–€900; we identify the failed component before pricing it.
What happens next
From your first message to your first full-power smile.
Tell us what you own
Send us the make, model, engine, modifications and what you want to feel after the tune.
We recommend the right stage
We will explain whether Stage 1, Stage 2 or a custom tune is the best choice and agree the price with you.
We do the tuning
Bring the vehicle to our Leon location or arrange a mobile visit across Leon and selected work within 200 km; worldwide tuning file service. We prepare the tune and keep your original file safe.
You enjoy the difference
We hand it back ready for the moment that matters — the first press, twist or push of the throttle after the tune.
Prefer us to come to you? Mobile appointments are available by arrangement across Leon and selected work within 200 km; worldwide tuning file service.
Talk to us
Tell us what you want to transform
Our location
Leon, Castile and Leon
Espana
By appointment
Tell us these five things
- What you drive or ride
- Which engine it has
- Which performance parts you have fitted
- Whether it has any warning lights or problems
- How you want it to feel after we tune it