Tip & How-To about Cars & Trucks

Service engine lights

I have found when you go to the gas pump and do not secure the gas cap correctly your engine service light will come on. Once you secure the cap as it should be then your light will go off.

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3 Answers

'service engine soon' light comes on one day, then is off the next--no pattern-- no intake or liquid leaks found by mechanics?? Also, 'low coolant' light comes on now and then, no leaks found; not even the water pump. ??

The low coolant light could be caused by trapped air in the cooling system. If the mechanic didn't doa diagnostic scan, that needs to be done. Even though the service eng. light didn't stay on continuously, there could be stored codes in the computer.

Jan 11, 2011 | GMC Yukon Cars & Trucks

1 Answer

Last week, being very cold out...I did not turn off the engine when I refueled my 2007 Lincoln MKX. Ever since...the check engine light has been on. I have open and reclosed the gas cap several times...and even topped off the gas tank once...hoping that, that would reset it. The cap is on securely. What can I do to avoid taking it in for service?

You should avoid a dealer and go to a local shop
to save money
You have to take in ,as you put it,anytime you get
any MIL Lamp or check lamp on the dash

Expect to have at least one a year

Your not servicing,your diagnosing trouble codes,
related to emission issues.

It could be a bad gas cap,but you don't throw
parts at it,you test first

Dec 20, 2010 | 2007 Lincoln MKX AWD

1 Answer


this happens because most time most people forget to tighten the Gas cap after fueling the vehicle. It is also mentioned in side the Gas cap compartment.
pls turn the Gas cap atleast three time with the clicking noise loud enough to turn head of the guy fueling by next pump.

Now, once u get these lights on what to do? well it should disappear next morning when u r starting it to get back to work. if now, find ur self a driveway or a road which is quite a bit of uphill or downhill and park the car there, turn the engine off, keys out and wait for 5 minutes. get back in and enjoy the clear dash.

Jul 29, 2010 | 2004 Toyota RAV4

1 Answer

Check engine light

If you haven't noticed any driveability issues, just the check engine light, your probably correct... O2 Sensor!

Jun 07, 2009 | 2006 BMW 3 Series

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