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data sheet of control valve
the egr valve is underneath the air filter housing. WARNING: there are multiple things to cause the EGR system to malfunction other than the valve (BPT valve, broken vaccum hose, solenoid, clogged ports, EGR temp sensor). A good diagnosis would be worth being wrong by just replacing the valve. Trust me, I used to work for a Nissan dealer
Code P1491 Means: EGR Valve Lift Insufficient Detected EGR Valve needs to be replaced
he discovered a artificial heart valve
To reduce the velocity