what items are needed to service an engine, when "service engine soon" lights come on. this is 2004 sentra 1.8S.
3 Answers
service engine soon lights mean that the PCM has detected a fault and needs to be corrected. Just like a Check engine light. And at a 140K the coolant should be changed as well as spark plugs, pcv valve, and air filter. Serpentine belt and tensioner should also be addressed. Since you have a timing chain no internal engine maintenance is needed.
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Like Chris said, the service engine soon light comes up when the ECU detects a fault that must be corrected. The best way to know what's up is to use an OBD2 scanner which will pull up a code that will direct you to what's going on. As for a 140K service Chris pretty much summed it up....
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My car Nissan Sentra is lighting ingine
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