#readiness monitors
4 posts in Car Diagnostics blog about "readiness monitors" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Preparing a car for sale: what to fix and what to disclose honestly
A buyer with an adapter will assess your car in twenty minutes. What is worth fixing in advance, what is cheaper to disclose, and why clearing codes before a viewing works against you.
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The drive cycle: how to actually complete readiness monitors instead of driving in circles
After clearing codes the monitors drop to not ready, and no emissions test will overlook it. What the ECU checks at each stage, why one long trip does not help, and the order to drive in.
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Preparing for an inspection: why "clear the codes first" is the worst possible advice
The most widespread advice before a test is to clear the codes. That is precisely the action that guarantees failure: the readiness monitors drop to not ready, and the inspector sees it immediately.
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Checking a used car with OBD: a 20-minute protocol to run before you hand over the money
The seller clears the fault memory five minutes before you arrive, and your scanner reports a clean bill of health. Here is the seven-step order that catches it: readiness monitors, pending codes, freeze frame, a cold start, and the module roll call.