Audi AdBlue Faults — Permanent Mobile Fix
Audi TDI engines (EA288 and EA189 generations) across the A3, A4, A5, A6, Q3, Q5 and Q7 use an SCR system with twin NOx sensors and precision dosing modules that are common failure points.
Common Audi AdBlue Symptoms We See
- AdBlue warning with start blocked countdown
- Fault code P20EE (SCR NOx catalyst efficiency)
- AdBlue consumption suddenly dropping to zero
- NOx sensor signal implausible codes
- Dosing module faults after winter freezing
Our Fix
After confirming which component has failed via live data, we apply the software bypass for the whole SCR chain — ending warnings, countdowns and repeat sensor bills in one visit.
Other Brands We Cover
COMPLIANCE NOTICE: Emissions-related software modifications (DPF, AdBlue/SCR, EGR, NOx) are supplied for off-road, track or export use where road-use restrictions apply. It is the customer's responsibility to ensure their vehicle remains compliant with UK road law and MOT requirements. Performance remapping remains fully road-legal subject to emissions compliance for the vehicle's age. Final wording under client review.