The exhaust gas recirculation or egr system is one of several vehicle emission control systems. The code p0400 is set when the egr system flow is less than expected.
Egr works by recirculating a portion of an engine s exhaust gas back to the engine cylinders.
Exhaust gas recirculation flow. It directs a portion of exhaust gases back into the engine intake to lower the combustion temperature read more how the egr system work. This is done by supplying small amounts of exhaust gases back into the combustion chamber. No x is produced in high temperature mixtures of atmospheric nitrogen and oxygen that o.
In view of current emission regulations some diesel engine manufacturers propose low pressure egr systems 1 4 as an alternative to the more. It helps reduce the amount of the nitrogen oxides nox in the exhaust gases. If the computer tells the scanning tool that the issue pertains to trouble code p0401 this means the recirculation flow of your exhaust gas has been detected as being insufficient.
Exhaust gas recirculation egr. On turbocharged engines the control of the exhaust gas flow is also done by means of the throttle 5 which when closed lowers the pressure in the intake manifold and facilitates the flow of gases from the exhaust manifold. The exhaust gas recirculation egr system is a part of the vehicle emission control.
Diagnostic trouble code dtc p0401 stands for exhaust gas recirculation egr flow insufficient detected. This dilutes the o2 in the incoming air stream and provides gases inert to combustion to act as absorbents of combustion heat to reduce peak in cylinder temperatures. The exhaust gas recirculation system recirculates a part of the exhaust gas back into the engine cylinders through the combustion chamber.
In most cases this happens when carbon deposits soot. What does the p0401 code mean. This code means that the computer detects insufficient exhaust gas recirculation egr flow in the system.
Exhaust gas recirculation excessive flow. Exhaust gas recirculation is the technique used for reducing the nitrogen oxide in both the internal combustion diesel engines as well as petrol engines. Hopefully you are driving a car that will automatically give you this trouble code on your dashboard.
By any chance if high combustion temperatures are created by oxides of nitrogen then an exhaust gas re circulation egr system which is the chief feature of this system will be boosted to counter this. In internal combustion engines exhaust gas recirculation is a nitrogen oxide emissions reduction technique used in petrol gasoline and diesel engines. Nitrogen oxides are normally formed in the process of combustion in the engine cylinders.
Benefits of exhaust gas recirculation egr. It is a part of the vehicle s exhaust gas recirculation egr system an emissions system designed to recirculate exhaust gases back into the vehicle s intake in order to reduce cylinder temperatures and nox emissions. Since the demands on exhaust gas purification are becoming stricter greater exhaust gas mass flow rates are required which are difficult to obtain with conventional high pressure egr systems.
The egr valve is one of the main components controlling the flow and recirculation of these exhaust gases.