I have a 2004 TJ with 3 inch coil spacers and i was getting a vibration in the drive shaft so i put in a skyjacker transfer case lowering kit. It made the vibration go away but my malfunction indicator light (MIL)came on, what caused this and how would i go about fixing it?

You need to first find out if the problem is with the system that the light is checking, or is it with the light circuit itself.

What does your manual state causes the light to come on? In other words, what system does it say is malfunctioning?

It is possible that lowering the t-case, thus placing a "tilt" on the entire drivetrain (engine, transmission, and t-case) put some kind of strain on the drivetrain, thus making the malfunction light come on. That is the more serious posssibility. Most people who lower their t-case are not aware that doing so can change the oiling characteristics of major components, some models more than others.

On the other hand, it is also possible that lowering the transfer case caused something in the malfunction light circuitry to go awry -- like a wire or tubing or linkage being stretched or rubbing against something because the t-case is now in a lower position than stock. I would crawl under the vehicle and really check out this possibility before doing anything else.

A third possibility, which should not be overlooked, is that the malfunction light coming on isn't related to the lowering of the t-case --- whatever is turning the light on may have just coincidentially malfunctioned at the same time the t-case was lowered. I'm not a big believer in coincidence, so I would investigate this possibility last -- but it could happen.

it says it could be caused by a missing gas cap or loose cap etc, bad gas. Just wondering if by give the transfer case a new angle it is telling the sensor that the fluid is low, if there is such a sensor

Given what you said, I'd carefully check the fuel supply line and fuel return line going forward from the gas tank. It may be that you bent or crimped one of those lines when you lowered the transfer case. Check the lines all the way forward, not just where they go past the t-case. Since the drivetrain is now tilted, check to insure that the fuel supply/return lines from the engine aren't now hitting the frame of the vehicle. Also, if you jacked up the vehicle when working on the t-case, you may have crimped a line with the head of the jack.

I got the code off my jeep, the code is p0135 (bank1 sensor 1 the o2 sensor i guess on drivers side cylinder 1 i was told.) How can i tell it is bad it's a little weird that this code is coming up after i lowered my t-case but i guess things happen that way. Can you tell me which sensor it i have 4 of them and they are all on the drivers side. <img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/patriot.gif" alt="" />

should be the one closest to the exhaust manifold