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P0171 and P0174 OBD2 Codes Explained - 1996 Chevrolet Corvette

Model: 1996 Corvette Fault Code: P0171 Posted: 2005-06-19 17:05

I recently encountered OBD2 fault codes P0171 and P0174 on my 1996 Chevrolet Corvette, indicating Bank 1 and Bank 2 are both running too lean. The fuel tank was initially about half full, so I refilled it. After doing so, the Service Engine Light turned off. However, I'm still seeking a clear explanation of what these codes mean and how to diagnose them effectively in this specific model. Any insights or troubleshooting steps would be greatly appreciated.

Related fault codes
P0171P0174
Comments (2)
Anonymous 2005-06-25 09:16

For detailed information on P0171 and P0714 OBD2 trouble codes, refer to these authoritative sources: https://www.obd-codes.com/p0171 https://www.obd-codes.com/p0174

Anonymous 2005-09-12 12:37

I experienced the same P0171 code on my 1996 Corvette, and after researching, I found a case where a technician diagnosed both P0171 and P0174 in both fuel banks. The fuel pump was tested and read at the lower end of acceptable specifications after replacement, but codes reappeared two weeks later. Further investigation revealed a vacuum leak caused by a tear in the master cylinder booster. The vehicle's ECU only triggered the code when cruising at steady speeds—this behavior confused many mechanics. This case highlights how vacuum leaks can mimic fuel delivery issues. It’s a valuable lesson for anyone troubleshooting this model. Hope it helps. Save the wave!