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Re: lights and dash flickering
You need the pump, or else an emissions diagnostic will fail and it will throw a P0410 code. If you have emissions testing in your area, the SES light and code will cause you to fail.
You can tighten up all battery/alternator cabling and clean the ground connection to the fender, but really, that diagnostic only runs for three times - three seconds each time, if the pump doesn't run when you start the engine. If you sit without driving off for 60 seconds, then the pump runs (when it was designed to) at start time, and it won't run the light-dimming diagnostic later.
The pump doesn't cause "problems" other than just dimming, does it?
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