Re: EGR Not Ready, the valve have been replaced, drove 600 miles
Every time you cut power from the ECU through either a dead battery, swapped battery, or just disconnecting power source to perform service work - it will reset the OBDII Diagnostics and it will create a ECU "Not Ready" state for many components.
In some states this can be problematic because a "Not Ready" state will most certainly cause you to fail state inspection.
I have heard many dealers say just drive the car around anywhere from 100 to 150 miles or so and come back for your inspection.
Here is how you create a "Ready" state for all your electrical components by driving about 8 - 10 miles
(for safety do it when there is little or no traffic):
The OBDII drive cycle begins with a cold start (coolant temperature below 122 degrees F and the coolant and air temperature sensors within 11 degrees of one another).
NOTE: The ignition key must not be on prior to the cold start otherwise the heated oxygen sensor diagnostic may not run.
1. As soon as the engine starts, idle the engine in drive for two and a half minutes with the A/C and rear defrost on.
OBDII checks oxygen sensor heater circuits, air pump and EVAP purge.
2. Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. OBDII checks for ignition misfire, fuel trim and canister purge.
3. Hold at a steady state speed of 55 mph for three minutes. OBDII monitors EGR, air pump, O2 sensors and canister purge.
4. Decelerate (coast down) to 20 mph without braking or depressing the clutch. OBDII checks EGR and purge functions.
5. Accelerate back to 55 to 60 mph at half throttle. OBDII checks misfire, fuel trim and purge again.
6. Hold at a steady speed of 55 to 60 mph for five minutes.
OBDII monitors catalytic converter efficiency, misfire, EGR, fuel trim, oxygen sensors and purge functions.
7. Decelerate (coast down) to a stop without braking. OBDII makes a final check of EGR and canister purge.
This was found at benzworld - but the procedure is good for any OBDII ECU