I 97 Toyota camry and recently it's been show code po401 and tells me that the exhaust gas recirculation flow insufficient detected... Now what can I do to it???|||Make sure the vacuum line to the EGR valve is attached to the EGR valve. If it is then the EGR valve, needs to be cleaned up or replaced.|||While the EGR system helps cool cylinder temperatures, I DOUBT that this is causing a hot manifold or high cooling system pressures... These two things should be checked by a shop... Hot manifold could be a fuel control problem of some sort, high cooling system pressure could indicate a combustion leak of the head gasket ( see if the coolant smells like exhaust fumes)
Hot manifold *could* also indicate a clogged catalytic converter, does the car run sluggish at all, or not want to accelerate well?
EGR basics: computer senses engine load, throttle position, amongst other values, and calculates desired egr flow. Egr flow is regulated by way of a pulse width modulated solenoid valve. There is a transducer in place to sense egr pipe backpressure, and help adjust egr flow accordingly... The computer then uses O2 sensor readings, knock sensor values, and other means to determine if the egr system is working properly.. Hence your P0401, computer sees a problem with egr flow.
Causes of this code are usually: clogged egr passageway(s), bad transducer (melted diaphragm), bad solenoid valve(s), broken vacuum hose(s), or bad egr valve
Are you prepared to make this diagnosis on your own? Code readers are great, and so is learning new things, but keep in mind modern engine control systems are very complex and usually requiire a pretty good understanding of theory to help make an educated diagnosis.
Have fun and good luck!
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