Home >> Volvo >> 1998 >> S70 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0170/EFI 231-EFI 232, DTC P0171/EFI 231-EFI 232 & DTC P0172/EFI 231-EFI 232 >> Possible Causes (Upper Limit)