1994 toyota camry four door code 52 knock sensor location

Assuming it is a v6 because 4cyl don't usually have this problems, they are located under lower intake into engine valley, the most common issue is a rodent eat away the harness or corrosion in connectors, replacing knock sensor harness will fix your problem if no corrosion found in sensors if damaged replace them there are no ease to reach has you will found out. good luck

Depends on which engine you have, if it's the v6 it's under the intake manifold, the 4 cylinder, it's on the side of the engine right above the oil filter.

Which is be hide the engine, on the top of the oil filter.