How to Deal with Urea Crystallization in the Exhaust Pipe?
2 Answers
The solutions for urea crystallization in the exhaust pipe include: modifying the layout and direction of the exhaust pipe, repairing the injection system, cleaning the crystallization in the exhaust pipe, or changing driving habits. More information about urea in the exhaust pipe is as follows: 1. The urea used in cars is primarily for regulating exhaust emissions and reducing atmospheric pollution. Urea is a liquid that is expelled along with the exhaust pipe. Crystallization of urea at the exhaust pipe is a normal phenomenon, especially in cold weather. 2. Drivers of vehicles that use urea should remember not to turn off the key immediately after shutting down the engine and not to switch off the main power supply. Wait patiently for three minutes until the urea solution has completely flowed back and there are no hissing or squeaking sounds before turning off the key.
I find it quite annoying when urea crystallizes in the exhaust pipe, which might be caused by excessive urea injection, poor evaporation due to low temperatures, or inferior urea quality. Here's how I've dealt with it: First, don't panic—try running the engine for a while to raise the exhaust pipe temperature and dissolve the crystals. If needed, gently wipe off external crystals with warm water and a soft cloth, but be careful to avoid the sensors. For prevention, I've switched to genuine AdBlue products and try to drive more on highways to avoid short trips in traffic jams. If severe crystallization blocks the system, the dashboard will alert you, and it's time to head to a 4S shop for professional cleaning to avoid affecting emissions and fuel consumption. A little tip: parking in a garage during winter can help reduce occurrences. Regular checks of the urea tank and injector can save a lot of trouble.
