Well guys my toy's engine light is on,i don't for sure what it is,but according to the check engine diagnostic perfomed at autozone the source of the issue is located at somewhere on the emision system or simply the gas cap that deffinetly needs to being replaced,the diesel knocking noise could be probally the EGR valve or worst the lifters according to my mech.
Thankfully i bought the mounster with two years warranty so my guess they'll take care of it

I'll have the code posted tomorrow so you guys might have the answer.