How to Solve Exceeding Emission Standards Level 5 and Level 7?
2 Answers
It is necessary to read the original fault codes for analysis to check if there are any fault codes indicating pressure build-up failure. If present, these fault codes should be addressed first. Check if poor-quality urea has caused crystallization and blockage of the filter screen at the urea pump's connector. In addition to replacing with qualified diesel, a comprehensive vehicle inspection should be performed.
Last time my car failed the emissions test, it took me a while to fix it. Generally, excessive emissions usually refer to high levels of CO or NOx in the exhaust, which could be due to carbon buildup or aging spark plugs. It's best to replace the spark plugs first, then check if the air filter is clogged—clean or replace it if necessary. Faulty oxygen sensors are also common; you can buy a universal one online and replace it yourself or have a small shop do it. If cleaning doesn't work, the catalytic converter might be clogged, in which case you'll have to replace it—though it's expensive, so I recommend getting it checked at a professional repair shop first. To prevent issues, use higher-grade gasoline with additives to clean the system, avoid short trips, and drive on highways regularly to allow self-cleaning. Ignoring excessive emissions not only means failing the annual inspection but also increases fuel consumption and pollutes the environment. Now, I stick to servicing my car every 5,000 kilometers for better preventive maintenance.
