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To reset your "not ready" status, google "97 Camry drive cycle" and you will get something like this. There are different versions but this one worked for me:

Typically you'll need to drive your Toyota Camry for 200-300 miles, and over the course of a week to two in order to set the required emission monitors.
While clearing your Toyota's EGR valve/systems trouble code(s) you also erased all of the emission monitors. Emission monitors are internal self tests which your Camry conducts to ensure its emission systems are working properly.
The following is a Generic Drive Cycle which should set all the required Monitors and let your Toyota Camry pass the smog test..
Begin by: (Make sure you have between 1/4 and 3/4 fuel in the gas tank. The EVAP test will not run while your Toyota has a full tank of gas or the gas tank is near empty).
  • Start the engine. Idle the engine in drive for two and a half minutes with the A/C and rear defroster on.
  • Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle.
  • Hold at a steady speed of 55 mph for three minutes.
  • Decelerate (coast down) to 20 mph without braking.
  • Accelerate back to 55 to 60 mph at ¾ throttle.
  • Hold at a steady speed of 55 to 60 mph for five minutes.
  • Decelerate (coast down) to a stop without braking.
If all other emissions systems are functioning properly, completing the drive cycle above should set the emission monitors required to pass the smog check. It will not hurt to perform the drive cycle 2 or 3 times before the smog inspection. Take caution when performing drive cycles on public roadways.
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