91 Camry V6 - Knock sensor

The check engine light on with code 52 - Open or short in knock sensor signal.
How many knock sensor does this car have? I found one between the V-engine heads behide the front.
Any advice on troubleshoot procedure for this problem is greatly appreciated.

It has two knock sensors, one on each bank. Knock sensors don't usually go bad. Most of the time is a bad connection or damaged wiring.

Exactly what he said.