What causes exhaust gas recirculation flow excessive detected?
The EGR temperature sensor is registering too much of a temperature change when the EGR valve is opened from a partly blocked exhaust catalyst causing excessive back pressure in the EGR system. The EGR is stuck open due to binding or carbon deposits holding the valve open.
What does excessive flow mean?
Excessive flow means any infiltration of ground water or inflow of surface water into the Raymond or ‘South Bend wastewater systems that exceeds the accepted standard of good design, construction, and maintenance practices.
Can a bad EGR valve cause a rich condition?
This is a serious problem because this can cause warpage or cracking of the exhaust manifolds resulting, in exhaust leaks. EGR Valves allow burnt exhaust gases to reenter the intake manifold, causing a rich fuel condition by reducing the amount of oxygen.
What causes excessive EGR flow?
Another common cause of excessive EGR flow has to do with the gasket used to create an air-tight seal between the EGR valve and its mounting surface. A damaged EGR valve gasket potentially allows exhaust to leak into your engine, even when your EGR valve remains in a closed position.
What is exhaust gas recirculation sensor A circuit high?
The P0406 code is the result of the exhaust gas circulation (EGR) sensor A having a high circuit voltage. This code is set when the ECM identifies the EGR voltage is higher than the specified range, thus triggering the check engine light to illuminate on the vehicle dashboard.
What causes EGR excessive flow?
Can EGR cause rich condition?
EGR Valves allow burnt exhaust gases to reenter the intake manifold, causing a rich fuel condition by reducing the amount of oxygen.
What is the diagnostic code for exhaust gas recirculation?
P0402 OBD-II Trouble Code: Exhaust Gas Recirculation Flow Excessive Detected. Cost of diagnosing the P0402 code. P0402 is a diagnostic trouble code (DTC) for “Exhaust Gas Recirculation Flow Excessive Detected”.
What is the diagnostic code for excessive EGR?
It is one of the generic diagnostic trouble codes in a number of makes and models that are related to the vehicle’s EGR. Code P0402 indicates that your car computer has detected excessive EGR. Note: The definition of code P0402 may be different depending on the vehicle manufacturer.
How does the exhaust gas recirculation system work?
The EGR or exhaust gas recirculation system helps moderate a vehicle’s nitrogen oxide emissions by lowering combustion temperatures. Just like any other car part or any other system in your engine, there may be faults that prevent your EGR from working properly.
Why is exhaust gas recirculated into the intake manifold?
When conditions are correct, the PCM commands the EGR valve to open, allowing exhaust gases to be recirculated into the engine’s intake manifold. Introducing these inert gases into the engine lowers combustion temperatures and reduces NOx emissions. EGR is only needed in limited amounts under certain driving conditions.