Dealership said I had a bad fuel regulator. They took my vacuum off and capped it at the intake manifold. Today I replaced fuel regulator and new vacuum hose took the cap off , now I have a check engine light saying to replace my fuel regulator codes read p0172 and p0170. I had no check engine light on before this and car rang great. Both o2 sensors was replaced bout a week ago . What do I do? ☹️ This dealership has gave me hell. Plz help. And do you think the dealer messed with my air/fuel ratio?? I’m lost at this point.
My car has 189000 miles.
My car has an automatic transmission.
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