How to Fix Common AdBlue Problems in Diesel Vehicles

AdBlue Warning Light On

When the AdBlue warning light comes on, it’s usually a sign that the AdBlue level is low, or there’s a problem with the system. The first step is to top up the AdBlue tank. If the warning light persists after refilling, it might indicate a malfunction in the sensor or SCR system. In this case, it’s advisable to visit a mechanic to check the system thoroughly. Continuing to drive with the warning light on can eventually lead to the vehicle going into limp mode, severely limiting your speed and performance.

Crystalized AdBlue

AdBlue can crystallize if it leaks or spills, adblue problem fix especially around the tank’s cap or the SCR injector. These crystals can block the injector or cause other issues within the system. To fix this, clean the affected areas with warm water to dissolve the crystals. It’s important to check for any leaks and ensure the cap is tightly closed to prevent future crystallization.

AdBlue Freezing

AdBlue can freeze at temperatures below -11°C (12°F). While most vehicles have a built-in heating system to thaw the frozen AdBlue, this process can take time. If you live in a region with extremely cold weather, it’s a good idea to park your vehicle in a garage or a warmer environment when possible. If the AdBlue system freezes, avoid starting the engine repeatedly, as it can damage the pump or injector. Instead, allow the system to thaw naturally or seek professional assistance.

AdBlue Quality Issues

Poor-quality or contaminated AdBlue can cause serious issues with the SCR system. Always use high-quality AdBlue from a reputable source to avoid contamination. If you suspect the AdBlue in your vehicle is of poor quality, it’s best to drain the tank and refill it with fresh AdBlue. Contaminated AdBlue can damage the SCR catalyst, egr removal/services leading to expensive repairs.

AdBlue Pump Failure

The AdBlue pump is responsible for delivering the fluid from the tank to the SCR system. Over time, the pump may fail due to wear and tear or contamination. A failing pump often causes the vehicle to go into limp mode or display an engine management warning. If you experience these symptoms, have the pump checked and replaced if necessary. Regular maintenance and using high-quality AdBlue can help prolong the life of the pump.

Blocked AdBlue Injector

A blocked AdBlue injector can result in insufficient AdBlue reaching the SCR catalyst, leading to increased emissions and potential engine warning lights. The injector can become blocked due to crystallization, contamination, or other issues. To fix this, the injector may need to be cleaned or replaced. Regular vehicle servicing can help detect and prevent injector blockages before they become a major problem.