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Old 09-26-2006, 12:07 AM
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Default Does low coolant trigger check engine light?

Hey All,

I'm trying to figure out if low coolant can trigger the check engine light?
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Old 09-27-2006, 01:04 AM
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i dont think it will, but i am not 100% positive. i believe our cars have a separate coolant like(thermometer(red)) that will show up if you are having a cooling issue like high temp or low fluid. bunch of other things can cause a cel. using low grade fuel for extended amount of time will cause an issue. or even the damn gas cap after a fill up. what was the last thing you did prior to the cel coming on? i am assuiming that you have a cel of course, otherwise you probably wouldnt be asking the question. eh
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Old 09-27-2006, 10:35 AM
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Default Not Sure

Well I just bought the car from the dealer two days ago. I do have a warranty on it so I can just take it into the VW dealer and see what the problem is. I did however notice that it came on after I filled it up with 87 fuel. Could that be the problem?
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Old 09-27-2006, 01:55 PM
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no the check engine light will not come on with low coolant. the coolant light in the gauge cluster would come one. and as for the gas thing it all depends on what u were runnin b4 u put the 87 in my guess would be the O2 sensor might have picked up the change in octane and tripped the computer but if u have a warranty id just take it back to the dealer and let them handle it
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Old 09-27-2006, 04:32 PM
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Yup, that's what I'll do.
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Old 09-28-2006, 12:01 AM
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no need to take it back to the dealer yet. same thing happened to my 02 1.8t the other day. my sister is using it and she told me that the cel came on. i aksed if she had noticed any performance issues, like limited power, hesitation, low boost. she said no. i asked if she had recently filled up the fuel tank. she said yes, but that she made sure the cap was on tight, so that wouldnt be the cause. i asked what kind of fuel she had been using, and she said she had been using 87 since she started driving it. told her to use 91oct minimum. she went out later that week and topped off the tank with 93. shortly after doing that the cel disappeared. my advice is to save a trip to the dealer for a few days. go ahead and use fuel until you need about a 1/4-1/2 tank to fill it back up. level it off with 93 and drive it for a while. chances are that cel will go away quickly. if it doesnt, then go ahead and take it to the dealer. this advice is only given based on the fact that you recently threw in some 87oct. if you have noticed something terribly wrong with the performance of your vehicle, like stuttering or noticeable loss of power, then you should definitely take the car in.
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Old 09-28-2006, 12:16 AM
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That makes sense, I'll try it out.
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Old 10-01-2006, 02:19 PM
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If you look on the fuel door there's a sticker telling you what fuel to run.
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