Q: Hi there i just recently purchased a 1997 Nissan Sentra it was kept in good hands and there was no probelm just a few days ago the "Service Engine Soon" light had turned on. I have noticed i lost feul economy, i tried changing my spark plugs however the old ones were in preety good shape what can be the fault of this light to come on!!

A: You can go to AutoZone and get codes read from your engine. Honestly, your symptoms seems nonspecific and can be any variety of things.
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