These are the problems that not using AdBlue properly can cause your engine

Diesel cars are often singled out as a source of polluting particles, but today diesel-powered cars are equipped with several systems that reduce these problems. Although we know these systems are very useful and allow a dramatic reduction in emissions of polluting gases, they can also cause complications if they are not used correctly or routine maintenance is not carried out.

In addition to the particulate filters and the EGR system, which are components that can cause many problems if they fail, diesel cars that meet the requirements of the Euro 6 standard also use AdBlue. This additive works by converting NOx particles into nitrogen and water vapour, eliminating part of their toxicity. AdBlue operates through the SCR, or selective catalytic reduction, system and, like any component of a car, it can suffer faults.

Consequences of not using AdBlue properly

AdBlue is a 32.5% aqueous urea solution, a product that is not toxic but is highly corrosive, so care must be taken when handling it. The tank is usually located next to the fuel tank and is filled through the nozzle beside the fuel filler, although it may be located elsewhere.

The SCR system consists of the tank, the pump, the valves and the circuit through which the AdBlue flows, and it is liable to faults. But if there is one important element in this circuit, it is the AdBlue. Diesel cars that are approved for use detect the level of this liquid and warn the driver if it drops significantly. When the tank reaches 30% capacity, the driver will be alerted.

As the level continues to fall, the warnings will become more frequent and should be heeded. Because diesel cars are designed not to run if there is no AdBlue in the tank, the first consequence of running this liquid down completely is a loss of power. The engine will switch to a reduced-performance mode, acceleration will not be normal, and the car will indicate that the tank needs to be refilled.

If the engine is switched off, the car will not restart until it has an adequate level of AdBlue, so care must be taken and the possibility of running out during a long journey must be anticipated. Many petrol stations stock this product, so you can reach one and top up without problems. Even so, it is advisable to always carry a bottle for emergencies.

The sensors in the tank will detect when it is refilled, and as soon as it reaches an acceptable level, the car will return to normal operation. A lack of this product does not usually cause engine damage, but it is not advisable to leave the circuit empty and to force the various components that make up the SCR system.