Question about Volkswagen Jetta

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I have a 2002 Volkswagon Jetta GLS 1.8T, the check engine light came on, so I took it to a garage and they pulled the code for me but wouldn't tell me what it mean't. I looked the code up online and found this, "Engine Coolant Temperature Circuit High Input (p0118)"! The only problem is I don't know what it means, whether its a sensor or a fan or........ If anyone has any ideas or knows what it might be, it would be greatly appreciated.

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  • Stephanie Branch Mar 27, 2011

    Ok, great thanks, I'll give it a try! I don't want to have to go "there" either! ;)



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All it means is that your car was overheating. THe code itself wont tell you exactly what is wrong. They wouldnt tell you because they know it is probably an easy fix and they want your money. First check and make sure your radiator is full to the top with water/coolant. Also put water/coolant in the reservoir mounted on the fender of the car under the hood to the appropriate level marked on the container. If you have trouble finding this reservoir, just follw the little overflow hose that comes off near the radiator cap. If the water levels are low, this could fix your problem for now but you really need to find out where the water is leaking from. If the car still overheats after making sure the water level are correct, the next things to check is the thermostat. It is located inside the upper radiator hose where it is attached on the top of the motor. Remove the upper radiator hose at that location and you wil see the thermostat sitting in the neck where the hose was attached. Pry it out with a screw driver. Put the hose back on and clamp it down securely. Replace any water that was lost in this process and again start the car and let it run for awhile and see if it stays cool. If it still overheats then there is a more serious issue but if this fixes it, then all you need to do is go to the auto parts store and get a new therrmostat like the one you took out and replace it in the same way you took the old one out..Make sure you out the new one back in the same direction. There is a backwards and forwards on these thermostats. Hope this help. Anyone who can use a screwdriver can do this.

Posted on Mar 27, 2011

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  • Stephanie Branch Mar 27, 2011

    Thanks for the advice, I know have another question.... The check engine light for this code stays on continuesly but my car has not overheated, not once and I have been driving it daily since about 4 days ago when the light came on. When I turn the heat to cold it blows out hot air and no cold and it seems to be running a little rough, but it hasn't overheated. Thanks for all the help thus far!!

  • rrreddd Mar 27, 2011

    it is probably just getting to the first stages of overheating, enough for the sensor to recognoze the temp is too high. It doesnt mean you would necessary observe anything out of the ordinary. Running rough is a sign of overheating. There could be other issues but am hoping this is the problem and we wont have to go "there".

  • Stephanie Branch Mar 27, 2011

    Ok, great thanks I'll give it a try! I don't want to have to go "there" either, because to me that means my wallet will be getting a whole lot thinner! ;)



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