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A faulty gas cap can cause this symptom.

Answerlow oil

faulty sensor

you should take it to AutoZone if there is one in your area. They do a check/service engine light analasys for free.

Answercheck the gas cap, if it is not on tight ( let it click 3 times) the engine light will come on. Good luck. AnswerI have same problem After they reset it at the service ,come back on after about three weeks .Theye found pin hole in the sim on the fuel tank.($500+ TAX out off warranty Nissan does not help is not their problem )Looks like a lot of people has similar problems.

My "SERVICE ENGINE SOON" light came on after a 30K service. I did as much research as you can imagine. The bottom line: I tightened the gas cap. Granted, this was the simplest solution. However, it took a full tank of gas before the light extinguished. At least it was something simple.

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βˆ™ 2011-09-13 17:55:38
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Q: What would cause the Service Engine Soon light to come on in a 2001 Nissan Frontier V6 at 20K miles?
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