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'97 BrightonRS '93 Impreza FWD
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Ok, I have had an MS3 HFC on my 25D swapped Brighton for almost 2 years now. For the last 3 years I have lived in Lake County CA (NEVER GO THERE) and I just moved to Sacramento about a month ago.

For the last year, my car will put up a P0420 every 80-100 miles... guaranteed. Since I moved to Sac, I got the code once about 2 days after I moved (still on a tank from Lake County). Since then I have done almost 2k miles around Sac in the last month and not one CEL.

The only things that I can see being different is gas quality, elevation (1k ft in LC... sea level in Sac), and most trips seem to be longer in Sac and mostly freeway... Anyone else ever notice anything like this?
 
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