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Does your kid know?! Haha! That hole is for the charcoal canister vent, and leaving it plugged will eventually cause a check engine light because if the canister vent is plugged the DME will not see a change in oxygen sensor activity when purging. There are two other valves behind the passenger headlight which can cause this issue, however the purge valve is usually the culprit. This is a tough one to offer advice on without seeing the car, and hearing the howl.
- Casey
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