#used car
4 posts in Car Diagnostics blog about "used car" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Digital service records: what the car stores and what it proves
The stamped booklet is being replaced by data held by the manufacturer. That changes what a buyer can verify, and what a seller can quietly omit.
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Code aging: how a fault clears itself after 40 warm-up cycles
Codes do not stay forever. The ECU counts successful warm-ups and eventually forgets — which is useful to know before you buy a used car.
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The first OBD scan after buying a used car: a 20-minute routine
You have the keys. Before the first long trip, twenty minutes with a scan tool establishes what you actually bought and gives you a baseline to measure against later.
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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.