Is it normal for the front wheel lights to flash on the dashboard when you put your Mitsubishi Pajero into 4WD?

They should flash for a few seconds then come on permanently while in 4x4 if they continue to flash open the hood/bonnet and just behind the air filter you will see two small solenoids with vacuum pipes attached,make sure there is no leaking pipes as I cured mine yesterday with the same fault when one of the pipes had come loose and burned through on the turbo. Mervyn