AdBlue systems consist of various components, so diagnosing faults is not always straightforward. Most of our AdBlue-related work has involved Peugeot and Citroën vehicles, with a considerable number of Mercedes C-Class and E-Class models, closely followed by most trade vans from Vauxhall, as well as French makes and Ford. This is without prejudice—just our observation based on experience.
We often hear from clients who have seen their vehicle display a countdown to non-start (e.g. 700 miles remaining) due to low AdBlue levels. However, even after topping up, the warning message may persist. Here are a few common causes for this issue:
- Float Sensor Failure: The float inside the AdBlue tank can degrade over time, allowing fluid to enter the float. This prevents it from rising when the tank is filled, so the system never registers as full.
- Nozzle Blockage: Crystallisation can build up on the AdBlue nozzle tip, restricting the flow of fluid.
- Pump or Heater Failure: Electrical faults or crystallisation in the pump or feed pipe—often due to heater failure—can cause the system to malfunction.
For Citroën and Peugeot vehicles, the AdBlue tank is a sealed unit and cannot be repaired. A replacement system typically costs around £2,000 including parts and fitting, with some systems reaching up to £3,000.
Our solution offers a permanent and more affordable fix. Please fill in our no-obligation quick quote form at the bottom of this page so we can identify your system and provide a fixed-price quote.
Important Note: If your vehicle displays a countdown to non-start—say, 100 miles—and you’re driving from London to Manchester (approximately 180 miles), be aware: as long as you do not switch off the ignition or stop the engine, the vehicle will not cut out when it reaches zero miles. It will get you home—just do not turn off the engine.
We hope this information is helpful during what can be a very stressful situation.
