#pending codes
5 posts in Car Diagnostics blog about "pending codes" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Mode 07: pending codes and catching a fault before the lamp
A fault detected once, not yet confirmed, and not yet worth a warning lamp. Reading these is how you find problems while they are still cheap.
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Two-trip logic: why the lamp waits before it warns you
A fault detected once does not light the lamp. Understanding that delay explains why a problem can exist for days before you hear about it.
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How often to run diagnostics: a schedule that makes sense, not "once a year just in case"
An annual scan catches what has already happened. A schedule built around pending codes and events catches what is about to happen — and that is the difference between prevention and repair.
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Before a long trip: what to check over OBD in half an hour in the garage
Most roadside breakdowns do not happen suddenly — they ripen over weeks and show in the data long before any lamp lights up. A seven-point checklist to run before you leave.
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When the scanner lies: ghost codes, false triggers, and why "a code" is not "a broken part"
The code points at a sensor and the sensor is fine. The code vanishes and returns a week later. Why that happens, how to tell a real fault from a side effect, and why the freeze frame decides more than the code does.