FERM and any other Jeep guys......

[C YENSEN]

i figured it will come back on.....hopefully not until I sell it

[C YENSEN]

Will The Check Engine Light Come On If It Is Low On Fluids Such As Transmission, Transfer Case, Power Steering, Brakefluid?

[tsubaki]

Don't think that is the case on Chrysler products. However I do know that Honda will do it. The windshield wider fluid can be low and it will set the light off.

[THEFERMANATOR]

If the tranny was low it could throw a code for slippage. As far as actual fluid level's, that would be a no. Brake fluid though will turn on the brake light in the cluster as the proportioning valve will trip the limit switch if it gets low or air in it. Reading the codes is really your only option to go with. Be careful though of the light when trying to sell it. If it is an OBDII readiness monitor that is throwing it, it will trigger the light after a highway drive. MOST codes will clear themselves after 3 consecutive engine heat cycles without the fault being present. The downstream O2 is famous for driving people nuts with an intermittent check engine light. I don't remember where the ground is at on a 99, but I know they give trouble with the ground for the downstream O2.

[C YENSEN]

well boys.....i took the battery cable off last week for an hour like I mentioned and the light is off...... I have driven it 55 miles and started it at least 6 times since then......I think I won

[C YENSEN]

well stopped at autozone and the check engine light is due to the throttle position sensor and a loose gas cap or vacuum line. looks like some good old WD-40 should fix the first problem (throttle has been sticky lately), and the second should go away if i tighten the cap a little more......at least i know what it is now

[THEFERMANATOR]

TPS is sealed, so I doubt spraying it down will help any. Replacement is about the only option on them. As for the other code, are you sure it was for a loose gas cap? Did they give you the P codes? The idiots at autozone once tryed to sell a buddy of mine a distributor for a shift solonoid code. Like I said earlier, i don't remember 99 having a leak detection pump. It was probably a fuel vapor purge solonoid code which is not an uncommon failure item. Always check what the P code is, don't trust the AUTOZONERS to tell you what is wrong. Get the code and check it yourself. I use em just to get the P codes and then go and figure it out from there. I'm to cheap to spend the money to get a scanner when I don't check but 3 or 4 OBD2's a year as all of my stuff is ancient.

Does your gas cap have a warning on it in regards to if you leave it loose it may turn on a check engine light?

[tsubaki]

Be sure and wipe the thick varnish from inside the butterfly location of the throttle body. Laquer thinner or WD40 should take it off, that will slightly improve idleing and takeoff.