You can find and exhaust system diagram for your 2003 Toyota Camry at most Toyota dealerships. Many local libraries will have Toyota service manuals with the exhaust system diagram.
You are looking at $500 at least plus labor (price varies depending on state).
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Answering "How do you replace the water pump on a 1994 Toyota Camry?"
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call a locksmith to do it. or replace the ecu.
You need to specify type of noise. I would assume you have problems with exhaust. If you do, you will have fix it or replace it.
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