Tag
#monitors
4 posts in Car Diagnostics blog about "monitors" — 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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Mode 05: oxygen sensor monitoring test results
The ECU already tested your oxygen sensors and stored the numbers. Mode 05 lets you read them, which beats interpreting a waveform by eye.
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Clearing codes: when it helps and when it hurts
The clear button looks like a solution while often destroying the evidence. When clearing is appropriate and what disappears with the code.