#readiness
5 posts in Car Diagnostics blog about "readiness" — OBD-II diagnostics, DTC codes, repair. ← All posts
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IUMPR: the ratio that proves your monitors actually run
A monitor that says "ready" once is not the same as a monitor that runs regularly. IUMPR is how the regulator closed that gap, and it is readable.
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The comprehensive component monitor: the one that never says "not ready"
Every readiness list has one entry that is always complete. It is not broken, and understanding why explains how the other monitors differ.
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How the EVAP monitor tests for leaks, and why it needs half a tank
The fussiest test on the car. Knowing its conditions is the difference between a week of aimless driving and a readiness status that completes.
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OBD codes and the emissions test: what actually fails you
Most emissions-test failures on modern cars are not about exhaust gas at all. They are about the lamp being lit and the monitors not being ready — both checkable in your driveway.
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P1000: OBD readiness not complete and why the test fails
P1000 is not a fault at all. It means the self-tests have not finished since the last code clear, and it is the most common reason a perfectly healthy car fails an emissions test.