If you drive a modern diesel vehicle, you’ve probably heard of AdBlue. It’s a special fluid that helps reduce harmful emissions and keeps your vehicle compliant with environmental regulations. AdBlue works as part of the Selective Catalytic Reduction (SCR) system, which converts nitrogen oxides into harmless nitrogen and water vapor, significantly reducing air pollution. While it plays a crucial role in lowering pollution, AdBlue isn’t without its problems. Issues like freezing, contamination, and system failures can lead to costly repairs and reduced performance. In this article, we’ll break down common AdBlue problems, the risks they pose to your vehicle, how to fix them, and whether removing the AdBlue system is a viable option.
Common AdBlue problems and their risks
1. Crystal Formation and Blockages
AdBlue is made up of 32.5% urea and 67.5% deionized water. If exposed to air or extreme temperatures, it can crystallize, leading to clogged injectors, pipes, and pumps. This blockage can disrupt the flow of AdBlue, preventing it from reaching the SCR system, which may lead to engine warning lights and reduce vehicle efficiency
2. Freezing Issues
AdBlue freezes at around -11°C (12°F), which could cause system failures in colder climates. Some vehicles have heating systems for the AdBlue tank, but if this feature malfunctions, frozen AdBlue can lead to starting problems and SCR system failure.
3. Contamination
AdBlue must remain free from contaminants like dirt, fuel, or even tap water. Any contamination can damage the SCR system, leading to repairs which don’t come cheap. Contaminated AdBlue can also cause chemical reactions that render it ineffective, triggering fault codes and engine derating.
4. Sensor and Pump Failures
The AdBlue system relies on sensors and pumps to regulate the correct dosage. Faulty sensors can falsely indicate low levels or system malfunctions, while failing pumps can stop AdBlue delivery altogether, causing emission-related faults and potentially reducing engine power.
5. Increased Maintenance Costs
Since the AdBlue system requires regular maintenance and refilling, it adds to vehicle operating costs. Replacing clogged injectors, cleaning crystal build-up, and repairing faulty sensors can be expensive and take up a lot of time.
Solutions to AdBlue problems
- Regular Maintenance: Routine servicing of the AdBlue system, including flushing injectors and cleaning the SCR components, can help prevent clogging and contamination issues.
- Proper Storage and Handling: AdBlue should be stored in a cool, dry place and only poured using clean equipment to avoid contamination.
- Using High-Quality AdBlue: Ensuring that you use certified AdBlue from reputable suppliers reduces the risk of impurities and system damage.
- Keeping the System Heated in Cold Weather: If operating in cold environments, ensure the heating system within the AdBlue tank is functioning correctly to prevent freezing.
- Timely Sensor and Pump Replacements: If sensors or pumps fail, replacing them quickly can prevent further damage to the SCR system.
AdBlue system removal
Some vehicle owners and fleet operators consider AdBlue removal as an alternative to dealing with its problems as it can save them time and money in the long run. This involves modifying the vehicle’s ECU (Engine Control Unit) to disable the AdBlue system. This process appeals to many people who wish to eliminate the above problems. Some considerations are:
Pros of AdBlue Removal:
- Eliminates AdBlue-related breakdowns and maintenance costs.
- No need to refill AdBlue, reducing operational expenses.
- Prevents engine derating or warning lights caused by AdBlue faults.
Cons of AdBlue Removal:
- Removing the AdBlue system is not advised for road cars due to environmental impacts but there are companies who can carry this out for you if it is what is best for your vehicle.
- Vehicles with removed AdBlue systems may in some cases fail emissions tests, leading to fines.
In conclusion
AdBlue is a crucial component in modern diesel vehicles, but it is not without its challenges. Crystallization, freezing, contamination, and system failures can all lead to costly repairs and operational issues. Proper maintenance, using high-quality AdBlue, and ensuring the system remains clean can help eliminate these problems. If these problems prove to be a challenge and are costing you money and time, then AdBlue Removal may be the way forward to help reduce these issues. Do consider the costs of this if you do want to go forward with the process.
