Mercury Sable 2002 95000 miles

Sounds about right, replaced a bunch of those.For some reason they only last a little while.Once they go out of range, the MIL comes on for "insuff EGR flow"

Thank you. If this works will the light go off after a couple cycles on its own or will I need a "Code Reader" to clear the code?
Will unhooking the batery work since I do not have a code reader. I had the codes read for free at Advanced Autoparts so I could go back if I have to but I feel guilty since they did not have the sensor I needed.

for your last question:
1/Fix the problem once the cause has been found
2/ Erase the computer code
3/ Test the vehicle to see if the symptom is gone
4/ Retest the computer to make sure the same code didn't reappear.

Your last question was removing the egr sensor to be a logical conclusion because everything pinpointed at it right?
The DTCs for the exhaust gas resirculation system will usually be set for one of the three reasons:
A control circuit fault, a no-or low-flow condition,or an excessive-flow or flow-when-not-commanded condition.
The DTC should identify the problem area but not NECESSARY the component at fault.
Once the DTC is retrieved ,consult the service manual to determine the necessary tests to be performed to isolate the cause of the code.
My conclusion is ,you may change the egr sensor to solve the problem now but do not be surprise if the same problem come back in few months.. or year...