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P0172 Trouble Code (system too rich bank 1)

This is a discussion on P0172 Trouble Code (system too rich bank 1) within the Computer & Tuning forums, part of the LSx Technical Help Section category; Getting this code for the last couple days. I was told that replacing the 02 sensor before the cat would ...

  1. #1
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    97 Z28

    P0172 Trouble Code (system too rich bank 1)

    Getting this code for the last couple days. I was told that replacing the 02 sensor before the cat would fix it,but it didn't. The other 02 sensor probably isn't my culprit because it doesn't really monitor the air/fuel mixture. The car idles fine when cold and then it starts to stumble a little when it gets warm.othere than the ses light coming on with this code,the car runs fine. any ideas?

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    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    maybe a leaking injector on the driver's side?

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    Member BLACKNIGHT03Z06's Avatar
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    Question

    Quote Originally Posted by Red97LT1 View Post
    Getting this code for the last couple days. I was told that replacing the 02 sensor before the cat would fix it,but it didn't. The other 02 sensor probably isn't my culprit because it doesn't really monitor the air/fuel mixture. The car idles fine when cold and then it starts to stumble a little when it gets warm.othere than the ses light coming on with this code,the car runs fine. any ideas?
    I get the same code on my Z06 from time to time. See mods in my sig. It will also stumble occassionally when i nail it at around 4500 to 5500 RPM's. I reset the computer and it will be fine for a while then pop back up.
    02' Z06 EB/EB 4.6K miles, Longtubes, Off-road X, Pypes X-back, Blackwing CAI, Comp. Cam 238/240-.605/.609-112LSA, Comp. Beehive Springs, Comp. Titanium Retainers, Comp. Perf. Push Rods, Comp. Billet Double Roller Timing Chain, Hurst Short Throw, Cray 19"/20" w/ Toyo Proxes4 265/30/19's & 295/30/20's

  4. #4
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    My mechanic found out that the MAP sensor was failing and had a vacuum leak. He replaced it and everything is OK now.

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    Token V6 Guy
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    Quote Originally Posted by Red97LT1 View Post
    My mechanic found out that the MAP sensor was failing and had a vacuum leak. He replaced it and everything is OK now.
    cool deal, I was just about to suggest it is probably a vacuum leak...those lean or rich bank codes are almost always a mechanical issue of some sort.

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