EPA Eases Diesel Emissions Sensor Requirements

The U.S. Environmental Protection Agency (EPA) recently revised its diesel engine emissions regulations, allowing the use of nitrogen oxide (NOx) sensors in Selective Catalytic Reduction (SCR) systems to replace the original urea quality sensors. This move aims to reduce engine malfunctions and power loss caused by poor-quality urea, thereby enhancing vehicle operational reliability. The new rule will directly impact diesel engine manufacturers such as Cummins, potentially simplifying their emission control system designs and lowering maintenance costs.