What does this symbol mean? I have a 2007 overland

Check on your motor you have some where a place how you have your number of your celynder

Check it out on you tube !

Try www.rockauto.com

check engine light it tied to all the engine control sensors (and more) Larger auto parts outlets will do a free code scan for you. Once you learn what the code is, you can buy a chiltons or haynes manual and determine what the code means and what you need to do to replace that part.

drivers side front of the engine i believe it is on the timing cover but the camshaft tone wheel is on the left side head.

Look in the owner's manual.

Call local jeep dealership. Give them your VIN number and they can supply you with the radio code. Did you check the glove compartment? Most of the time its located inside on a sticker.

Best bet is to start with an aftemarket performance air intake. (ex-K &N, AEM). Exhaust (flowmaster) is the next step. with those two you should an additional 15 ish horses. next step would a chip module. (ex-hypertech). Additional horses for you.

Intake will give you instant results. Throttle response, air flow, and a better sound
Exhaust. Will sound great. May not notice the performance portion, but needed.
Chip Module. Your biggest expense without getting in big, but will take your jeep to the next level. lets your jeep open up and remove rev limits and such. Fun to play with and works. Don't fall trap to knock offs. You find a whole lot junk like on ebay. Stick to the heavy hitters with this. (Jet/Hypertech to name a couple.)
Check out www.jegs.com to look at some performance parts. There a decent site with a lot to look at. Have fun.

What u mean that it cannot be dublicated in the shop?

if you are talking about the yellow engine symbol in the instrument cluster it is telling you there is some kind of problem and you ned to have the codes checked to get an idea what it may be