04 Sentra 1.8

[newbe04]

hello, new guy here.

My girl's car is a 04 sentra 1.8 auto. She has a couple problems with her car. and I am trying to see if I can get some of it fixed when she is gone for a while.

One problem is that her OD shift button has a mind of its own. it seems to be at the shifter area that is causing it because you can wiggle the shifter and it will change from on to off. but the bad part is it does it when driving too. making it shift from 3rd to 4th a lot, which I can only imagine is not good for the trans. how do I go about fixing it?

problem two is a while ago she got the oil changed and the mechanic said that she could have a blown head gasket. because there seems to be "some" coolant coming out and is baking on the motor leaving a green mark between piston one and two(left to right). but I have not noticed any more coming out nor a loss in coolant. the car does not puff white, it has lots of power. the motor has approx. 55 k on the clock. is there something else that could cause the green mark? if I take the plugs out, what should I be looking for on the plugs to indicate a blown gasket? taking the plugs out is just as easy as anything else right?

Thanks, Matt

[newbe04]

ttt

[nametakennow]

The HG issue is fairly common on that engine. Those are preliminary symptoms. I'd take care of it when there's a good opportunity, but since it hasn't failed completely yet and the car is running well, you have a little flexibility on time.

As for O/D, tough to say what's causing it. Electrical issues can be very tough to diagnose.