Where is the knock sensor located on 1996 Camry four cylinder engine?

It won't pass smog in California because the 1st thing a smog tech does it check for fault codes on the vehicle's computer with a scanner.

no bypass to beat smog - emissions test didnt specify engine 4 8 5 3 6 0 knock sensor replacement GM Escalade 2004 knock sensor location and these links can assist in replacing sensor

If the code is p0325, it should be repaired, HOWEVER, on nissan products from 1996 to 2002, a p0325 does NOT illuminate the check-engine lamp. Knock sensor on that vehicle is for PING control not for emissions reduction. On other vehicles (say a chevy with a p0325) it WILL light the check engine lamp which is an automatic smog fail.

92 camry failed smog because running rich. Why? - Toyota Nation ...

www.toyotanation.com/.../411132-92-camry-failed-smog-because-runni...

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Toyota Camry running rich Questions & Answers - Fixya

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... running rich I have a 1991 Camry that is running rich. I just replaced the O2 sensor and a new cat, oil change, new spark plugs. The car wont pass smog. it is ...

1992 Toyota Camry XLE V6 Excessive Running Rich ...

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1992 Toyota Camry XLE V6 Excessive Running Rich ... 1997Toyota Camry V6 forward Oxygen (O2) Sensors .

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

They are in the V of the cylinder block. You will have to remove some stuff to get at them. See here p137

http://www.turboninjas.com/camry/eg2.pdf

On the 2.4 liter four-cylinder engine it is located on the siie of the engine block (the side nearest the firewall).

On the 3.0 Liter V-6 engine there are 2 knock sensors and the are located in the "valley" below the intake manifold. You'll have to remove the intake manifold to get to them.

Should be on the side of the block facing the firewall. It may or may not be contacting coolant so you may have to drain the radiator.
Keep in mind knock sensors almost never fail. You may have an engine component making a noise or vibration the sensor is picking up.
The sensor is supposed to sense spark knock and tell the computer to adjust the spark timing down.

Is it running rough? Is the check engine light on?

check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.