Firewall separates engine bay from the passenger cabin.
Knock sensor is located in the wall of the engine block facing the firewall. You have lift the car if you want to reach it.
It's next to the timing belt gear. The sensor can be accessed from the the firewall side.
The 1998 Camry did not have a serpentine belt. Do you have a 1998 Corolla?
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The 1998 Toyota Camry V6 has about 150HP
Throttle position sensor is located at the throttle body. There are only two sensors there. The one facing the firewall is what you are looking for.
Toyota Camry 1998 has a timing belt.
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No, it will not.
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What about the firewall, Don't understand the question.