The Emission Faults That Show Up Right Before an E-Test and Disappear After

The system runs a self-test during specific driving conditions, usually at low speeds after a cold start. If the conditions are not right, the test does not run, and the fault may not show up on a given drive. This is exactly why some drivers arrive for an e-test in Ontario with a clean OBD readiness report and still carry an underlying EVAP problem that surfaces again weeks later.

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