Code: P214A
Definition
SCR NOx Catalyst Inlet Temperature Too High
Description
Selective Catalytic Reduction (SCR) is a technology that uses a urea-based Diesel Exhaust Fluid (DEF) and a catalytic converter to significantly reduce nitrogen oxide (NOx) emissions. The system achieves this by injecting small amounts of Diesel Exhaust Fluid into the exhaust system upstream of the catalyst, where it vaporizes and decomposes to form ammonia and carbon dioxide. The ammonia is the desired product which, in conjunction with the SCR catalyst, converts NOx into harmless nitrogen and water. Excess fuel or oil entering the exhaust system due to a faulty engine component or fuel injector can cause a temperature increase and damage the SCR catalyst. The Diesel Exhaust Fluid Dosing Control Unit is used to control the operation and monitoring of the Diesel Exhaust Fluid system.
Cause
- EXHAUST GAS TEMPERATURE SENSOR 1/4 FAULTY IN RANGE
- Engine misfires
- EXCESSIVE FUEL OR OIL INTRODUCED INTO THE EXHAUST SYSTEM
- FAULTY DOC/DPF CATALYST