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How to fix '97 Accord CEL P0170 & P0171 Codes?

My Accord has 190K miles. Any suggestions on the way to fix codes P0170 (Fuel trim bank 1) and P0171 (Programme too lean)? I would hate to begin playing the sensor replacement guessing game. I have seen a number of posts indicating it could be the upper O2 and others say it is a vacuum leak. Where ought to I start and what ought to I check after that? Thank you.
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98 accord 4-cyl VTEC, problem code P1259 is coming up, what will the dealership do to fix this?

I reset my pc and it came right back up. Since this code has popped up, my rev limited is kicking in at about 3800-4000 rpms and the car does not have the additional power from the VTEC like it used to. What will the dealership do to fix this and the way much will it cost?The dilemma code is "VTEC programme malfunction" if that helps.
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evap leak code po1457 2004 honda pilot 3.5?

evap leak checked for leaks with smoke found none also checked cap also great replaced bypass evap valve even now have problem i'm able to watch the fuel pressure sensor and amongst car off i've 1.5volts ought to be 2.5 with cap off start up car than it gose up to 2.5 also jumped out purge solinoild to any other ideas
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