Exhaust
AdBlue System Problems — Causes and Solutions
AdBlue system faults cause reduced power and warning lights. Common issues include crystallisation, failed pumps, and NOx sensor faults.
AdBlue is a urea solution injected into the exhaust to break down NOx emissions on modern diesel vehicles. The system includes a tank, pump, injector, and sensors. Common problems include crystallisation around the injector nozzle that blocks the spray, a failed AdBlue pump, a faulty NOx sensor, and the heater element failing in cold weather. If the system detects a fault, it will trigger a warning light and eventually limit vehicle speed. Running the AdBlue tank dry and ignoring the low-level warning is a frequent cause of pump failure. Specialised diagnostic equipment is needed to identify AdBlue system faults accurately.
Key takeaways
- AdBlue crystallisation around the injector nozzle is a very common issue
- Running the tank dry is the main cause of AdBlue pump failure
- System faults will limit vehicle speed — address warnings promptly
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