The United States Environmental Protection Agency has shared that diesel engine manufacturers might start moving away from using urea quality sensors in their emissions systems, as these sensors have been identified as one of the most likely components to fail in selective catalytic reduction systems.
In a guidance update from Administrator Lee Zeldin's agency, the EPA mentioned that manufacturers are allowed to consider alternative methods, like nitrogen oxide sensors, to ensure the quality of diesel exhaust fluid, as long as they continue to meet emissions compliance standards.
Urea quality sensors play a crucial role in monitoring urea concentration in diesel exhaust fluid, which helps in lowering nitrogen oxide emissions. When these sensors fail, it can lead to reduced engine power or even shutdowns, causing operational challenges for truck owners.
The EPA highlighted that if manufacturers replace faulty sensors with another reliable emissions-monitoring solution, it wouldn't be deemed illegal tampering under federal law, although emissions-delete modifications are still not allowed.
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June 12, 2026 17:14 ET Major central bank action was the focus this week in economic news. The European Central Bank became the first major central bank to move in response to the rising inflationary pressures in the backdrop of the conflict in the Middle East. In North America, the U.S. inflation and trade data as well as Canada’s central bank decision gained attention. The Chinese trade data was the main news in Asia.