Hey everyone! Having a problem with a friends 02 WRX. She is pulling an errorcode P0171. Which means a lean condition in bank 1 i believe. The car in the lower rpms seems to also be running a bit rich to compensate. Besides Cleaning all 02 Sensors, any idea how to fix this problem? The car is obviously out of warranty and we are trying to fix this in the most affordible way possible, so anyone who can give me any tips please help!