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Many of us Mitsubishi Pajero owners will face the dreaded orange blinking Center Diff Lock light sooner or later. All Mitsubishi Pajero Gen4 green lights for the wheels will be OFF, and only the orange center diff lock light will be blinking. There are a few reasons why this occurs. When the ECU notices a vacuum leak after 10-15 mins, it will engage the orange Center diff lock light and will start blinking. Restarting the vehicle mostly does the trick, but if this happens more often, you might be having an issue with either the vacuum hoses, or the solenoids. The first thing to check are the vacuum hoses underneath the car that connect to the freewheeling clutch actuator: This actuator is a small piston that is controlled by vacuum. Check if the vacuum hose is still intact and does not have any cracks in it. Pull back the rubber boot and remove dirt and sand that you will definitely find in there when you go for regular offroading. If all this is verified and found OK, but the problem still persists, move on to the vacuum solenoids, which are located in the engine bay next to the air filter box. Below you will see the set. Mitsubishi No. 8657A031 for a Pajero 4th 2008. Price is around 360 Dhs. Replacing the actuator set: (TAKES MAX. 20 MINS) With a 10mm ratchet you can easily unscrew the two bolts holding the unit in place. Remove the black vacuum hoses by twisting and turning them. They might be a bit stuck so you can use some pliers to twist them gently, and then remove them by gently pulling them. Now remove the 2 electrical connector (push the small lever on top, and pull). They might also be a little bit stuck with dirt and sand and over the years, just take your time and don't force it. Now install the new unit and make sure to put the electrical connectors and 3 vacuum hoses in the exact same way. You will see that there is a solenoid with a Blue dot and a solenoid with a Yellow dot for easy referencing. The old unit can be tested with an Multimeter with Resistance (Ohm) measurement setting, but will not give you 100% confirmation that they are defective or not. We have seen intermittent problems with these solenoids where they become sticky during hot weather only. With the multimeter, put it on Ohms, range 200, and measure the resistance of each solenoid. It should be approx 40 Ohms. If it is above or below, this is the indication that they need replacement. In my case this was an intermittent failure that would come up once in a while, especially during hot days, so i've decided to replace them as the vehicle is 12 years old.