My corvette is throwing codes
Thread Starter
3rd Gear
Joined: Mar 2025
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My corvette is throwing codes
My 2016 1le Stingray is throwing codes P0171- System too lean bank 1
P0172- System too rich bank 1
P0174- System too lean bank 2
P0175- System too rich bank 2
Its acting funny I’ve only had the car for a month and don’t know much about corvettes, which I’m trying to learn
P0172- System too rich bank 1
P0174- System too lean bank 2
P0175- System too rich bank 2
Its acting funny I’ve only had the car for a month and don’t know much about corvettes, which I’m trying to learn
Racer
Joined: May 2023
Posts: 336
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From: Niagara, Ontario, Canada
Welcome to the forums, those are basic codes for any vehicle, Here's a simple video of one code, the others similar nature, hopefully just a plugged air filter. Let us know how you made out on the repairs .
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Good luck with the repair. Hope it is something relatively simple and inexpensive.
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Having a stuck EVAP purge valve can set both lean and rich DTC’s especially after filling your gas tank…the intake manifold will draw in gas fumes from your EVAP canister and that will set rich codes and when all those gas fumes are burned it will then set lean codes because you basically have a vacuum leak at the intake manifold.
Le Mans Master
Joined: Oct 2008
Posts: 5,708
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From: Irving, TX
I'd clear them and see what comes back. If you get them after filling up the tank look at what C5Diag said. If they come right back clean your MAF with the appropriate cleaner. It also wouldn't hurt to check your intake for leaks after the reset.
Team Owner
Joined: Jul 2004
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From: Hartford WI
I wonder if there is a way to check the MAF? Obviously it hasn't failed bad enough to throw a code but if you know what range of values to look for, maybe there is a way to see if it is reading right? Not sure.
Moderator, Tech Contributor
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If one has a DVOM with a frequency setting that can be used…I use a lab scope.
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Team Owner
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From: Hartford WI
Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
Yes, you check in grams/second…MAF reading should be equal to the liter displacement of the engine at “hot unloaded idle”…6.2 liters equals no less than 6.2 grams/second.
Team Owner
Joined: Jul 2004
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From: Hartford WI
Is that this car or pretty much any car where I just take the displacement and that is the g/s? IOW, my 4.0L car will read 4.0g/s and my 6.2L truck will also be 6.2 g/s?
Moderator, Tech Contributor
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From: Cape Coral, Florida
