quick car question-timing belt and water pump

<p>Timing belt change is rec 110,000 miles for Honda…
Too much money - Belt and pump under $700. (perhaps under $500.)
Tune-up - mostly handled by on board computer - so what does a tune-up mean (maybe replacing the O2 sensor ?, PVC ?, spark plugs?, wires?, filters - mostlikely way over priced so make sure you know exactly what it covers.</p>