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Vent: the guy at Advance Auto talked me into $140 in parts I didn't need, and I only figured it out after
Last Friday my check engine light popped on in my 2013 Corolla, so I ran down to the Advance Auto on Route 9 in Poughkeepsie, and the guy behind the counter pulled the code, looked at me real serious, and said it was the mass air flow sensor, the O2 sensor, AND a vacuum leak, so I walked out with $140 in parts. Spent most of Saturday on YouTube learning how to swap the MAF and cleaning the throttle body with a $9 can of cleaner, and the light came right back on Sunday morning. My neighbor Dave, who used to turn wrenches at a dealership for 20 years, came over, borrowed my $15 code reader, and the actual code was P0455, which is just a loose gas cap. He twisted it till it clicked three times, cleared the code, and it's been off for a week now. What got me was when he said the parts guy probably gets a spiff on every sensor he sells, and I never even asked to see the live data or the freeze frame, I just handed over my card because he sounded like he knew. So now I want to know, do you all read the freeze frame data before you buy anything, and does anyone have a code reader app they actually trust for that?
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matthewgonzalez12d ago
Man, hate to break it to you but that gas cap code and the MAF/O2 stuff are kind of two different things. P0455 is your evap system, so it's usually the cap, a bad purge valve, or a cracked hose, and it wouldn't have thrown a MAF or O2 code at all unless those were bad too. So the guy either read the codes wrong or just saw a chance to sell you parts, which is the part that bugs me... if the only code was P0455 then none of those parts were ever gonna fix it. As for your real question, yes, always ask to see the freeze frame and the live data before you spend a dime, because freeze frame shows what the engine was doing the exact second the light tripped and that tells you way more than a code number alone. For apps, Torque and Car Scanner work fine with a cheap bluetooth adapter, but honestly your $15 reader already did the job Dave needed, so you're not missing much.
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