What does the SCR warning light mean?

[McGabriel]

The illumination of the SCR warning light in the engine indicates a malfunction in the corresponding component. Common causes include: insufficient urea level, faulty nitrogen oxide sensor, defective urea injector, clogged urea injector, or malfunctioning urea pump. Engines encompass various types such as internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, and electric motors. Here is additional information: 1. Professional diagnostic equipment is required for troubleshooting: Similar faults generally necessitate professional diagnostic tools. It is recommended to refer to the maintenance manual's service checklist and visit the nearest service station for inspection and repair, with free repairs covered under warranty. 2. Selective Catalytic Reduction (SCR) technology: SCR is a treatment process targeting NOx emissions in diesel vehicle exhaust. It involves injecting a reductant (ammonia or urea) in the presence of a catalyst to convert NOx in the exhaust into N2 and H2O.