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Over the years, Citroen has come up with more than a few quirky ideas. The second car it produced, the 1922 Type C 5HP, became known as the ‘petit citron' (little lemon) because of its small size and the yellow paint colour you could order it in. Since then, there has been the Citroen Picasso, taking inspiration from Pablo Picasso's use of shape. The Citroen DS 19 was the vehicle of choice for the French President Charles de Gaulle, who survived an assassination attempt in 1962 thanks to the car's superior suspension system, allowing his chauffeur to drive away after two of the tyres were shot.

AdBlue is a diesel exhaust fluid sprayed in small amounts onto exhaust gas, turning the NOx into less harmful nitrogen and water. If your car runs out of AdBlue while driving, its performance will be significantly reduced; when you stop the engine, it won't start again until you refill the tank.

Pump failure is one of the most common issues associated with the AdBlue system. Fortunately, an AdBlue pump repair or replacement isn't usually costly. Other problems include contamination and failure of the nozzle, NOx sensor and the AdBlue control unit.

You'll need to book an AdBlue system repair if your car develops any of these faults. Most of the time, the mechanic will run an AdBlue fault diagnostic first. Booking a car AdBlue service, which involves a top-up of fluid and a general check of the system's components, can help prevent the above issues.