My check engine light came on recently. The tester revealed codes P0172, P0175, and the computer printout just suggested a valve adjustment to fix. I've ordered new upstream oxygen sensors, but I discovered that when I use Shell V-Power, the check engine light goes off and says off. As soon as I run another brand of gas like Costco 93, it comes back on! Is the new formula of V-Power that powerful? Flipped out, huh?

I'm sure I likely need new O2 sensors after 314K miles, but could V-Power be the ultimate gas to run our cars on?.
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That's interesting...

 

What's more interesting is the system stops throwing those codes when the light goes off! I'm still gonna replace 314K mile/15 year old O2 sensors and get another valve adjustment anyway despte the fact that I can still do 0 - 60 in under 6 seconds.
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Huh....I mean, I'm not sure about V-power, but I use marathon 93 "with STP fuel treatment added" and I would think maybe that the shell stuff is similar.....Which is essentially a bit of seafoam in your gas, removing carbon deposits, removing moisture in fuel systems, etc. I would think there's probably a correlation between the codes and using a treated gas, vs using untreated gas. BUT, correlation does not imply causation. So who knows lol.

 

Costco is treated with plenty of detergents. For me, its V-Power or bust.
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interesting fact; Shell's V-power was developed with Ferrari

 

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If you have a bluetooth OBDII reader using Torque app, and can read that the short term fuel trims are jumping wildly, then you should replace the 2 downstream O2 sensors. I recently replaced the 2 downstream O2 sensors on my AV6 and gained 2mpg. Short term fuel trims stopped jumping wildly. upstream AF sensors aren't the issue for me. I had no CEL either, just figured I should change them out after 305k miles while I had the exhaust dropped to reseal the oil pump.