what items are needed to service an engine, when "service engine soon" lights come on. this is 2004 sentra 1.8S.
Light engine lights came on saying "service engine soon". Apart from the regular tune-up and transmission service, what is needed to be done for a 140K miles car?
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.
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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