[Ed_Strong]

I'm with 12Ounce on this one, the IMRC actuator acts as a way to induce more air into the combustion chamber by means of extra buttleflies in the Intake Manifold (sort of like the old school secondaries on a carburetor).

As you step on the gas to gun the engine, the ECM sends a signal to the IMRC actuator (somewhere around the 3000 to 4000 RPM range), which in turn opens this extra butterflies to give the engine the extra shot of air it needs to power up.

The linkage that connects the IMRC to the actual butterflies is held by plastic clips that degrade and break over time. So, when the ECM sends that signal for extra power and the IMRC activates, but the engine doesn't respond to the change, the ECM will activate the MIL and a code or codes are stored to memory indicating there's been a malfunction in engine performance, in this case P1519.

So in turn the O2 Sensor is looking for a change in Air/Fuel mixture that is not happenning, so this P0141 code may or may not be an indication of a bad O2 Sensor. First get the IRMC problem corrected and see if this will in turn auto eliminate the O2 Sensor code.

If this does not fix the P1519 then I would look at the O2 Sensor plug and connection aswell as the wiring leading up to it. It might have tangled and come into contact with the exhaust or any other hot part of the engine and melted the insulation causing it to short and malfunction.

P1000 - OBDII monitor testing not completed this code should be ignored, it's just a standard code. When that happens it just means that the ECM is relearning the parameters of the drivetrain, this happens when the battery is disconnected and it normally clears itself of after several miles of driving. You may notice a bit of harsh/rough performance as the ECM re-learns shift points, throttle response, operating temp, speed and slow down cycles, etc.

Also lifting a battery cable for a minute to "clear" the codes does not work any longer with newer vehicles, this needs to be done with an OBD Tool, Scan Tool or PC that can connect to the ALDL connector under the dash.

Hope this helps...