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OBD II scanner from Harborfreight 850 1997

At first, my mechanic replaced the pump. Couple weeks later, CE light came back on, he confirmed pump itself was functional, and replaced relay. CE light came back on after 2 days. That's when I decided that I could do just as good a job myself. The light comes on rather sporadically (after I clear it), sometimes it takes days, sometimes even weeks for it to reappear. Seems to be more frequent in cold weather. Don't quite understand why that would be - does it suggest the system is "kinda" working, just not really well? Anyhow, assuming relay and pump are functional, I'll focus on the Valve and any vacuum leaks. Whatever I fix, I'll then have to drive around for days or weeks to see if that light comes back on. Not my idea of instant gratification...
Meanwhile, Harborfreight has agreed to exchange the unit - hopefully the replacement will work better.
I live in Branford - same neck of the woods!






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