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Originally Posted by cyrnel
I wouldn't suspect plugs with mileage dropping off somewhat suddenly. Still, at 96K in 11yrs I'd be changing them and the O2 sensor, and whatever PCV/EGR valves it has. That assumes you didn't buy it 2yrs ago from someone who gave you great service records... (hint, hint?) I'd be looking for vacuum leaks, too. There may be other wear items to consider. Don't buy everything but pay attention to the parts they offer to sell after dumping codes, and get the codes, not just the interpretations.
Declining mileage can be evil but it's usually a matter of replacing a couple wear items. I'm willing to bet you'll notice a power improvement, too.
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He about summed it up.
I just wanted to add that's pretty much what I'd be looking to do also, given mileage and age.
FWIW, each time (three different cars) I've experianced a sudden drop in gas mileage that wasn't from anything obvious, it turned out to be a failing O2 sensor, and not once did the check engine light go on. I couldn't tell you if that was because the car was too old to have OBD-II, or because an O2 sensor can fail enough to tank (PUN!) your mileage without failing enough to trigger the dash light. Either way, a new sensor later and mileage was right back up where it was supposed to be.
02, plugs, air filter...yeah. When you go to sell you can advertise it just got a tune up!