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if your scan tool has a "02 cross counts" look for a changing number ,this means its going above and below .450 mv. ....or you can monitor the 02 data while you give the motor a small vac. leak. with the system hot and idling in closed loop .450 mv is what its trying to maintain...so expect the numbers to move around [depends on the tools sample rate] ...a lab scope is better but DONT EVEN DREAM ABOUT BACK PROBING THE 02 WIRES. quickly press and release the gas pedal and look for high mv,next if you can safely go WOT for a few seconds look for .900/950 mv while on the highway at say 5000 rpm upward. OR if the check engine light isnt on dont do anything ....they are working
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