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I need help



I have an 07 CXN613 mack. The problems I have are: Fuel Gauge, Oil pressure Gauge , EGR  sensor and now engine fan constantly running.

1. Fuel gauge has been giving me wrong reading for the last 3 years. I have replaced the gauge and the floater but the problem has not been resolved.

2. For the Oil Pressure, 2 weeks after an oil change the pressure drops to around 20 at all times.

3. EGR sensor does not work. thus fail emission every time.

4. The engine fan stays on as long as the engine is on. This started after I replaced  the tensioner which  broke and cut the belt . Truck overheated and shut off.

I also  noticed sometimes when I'm  going up a long grade with a heavy load, the engine shut off comes on but the temp isn't high.

I'm really getting frustrated. Can someone please help


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