Hey guys so heres the problem im having, i just bought a 2000 ap1 with an f22c in it, it was running on the ap1 ecu but was throwing a cel for running lean p170 and p0171 as you all know this is a common problem when running an f22 on an ap1 ecu , so i went and bought an ap2 ecu took it to the dealer they swapped and programmed the ecu yesterday , i drove the car around today no cel , then i plugged in my obd2 scanner and its still showing system too lean bank 1 WTF even with the new ecu, are codes stored on a separate module? Thanks for any input

 

Have you tried a hard reset since then to clear them?