[4th Gen : 01-07]: P0171 code
#1
#5
Sorry man, P0171 means your running lean in bank 1. My bet is you have clogged injectors, not getting enough fuel. The code doesn't mean o2 sensors or cat problem. Get a can of bg44k on ebay or some local auto dealers have them for around 22 bucks. Use it, works very well. Will clean your injectors in one tank.
#6
what year and engine. diagnosis is different depending if its speed density fuel metering or maf sensor controlled.
check the fuel trim.
need to know if its running lean at idle or at higher rpm, on both banks or just one bank. just because the dtc is setting for only one bank, doesn't mean the other bank isnt lean also...check with the scan tool.
if both banks are lean all the time, check fuel pressure. if its only lean at idle, you have a vacuum leak.
check the fuel trim.
need to know if its running lean at idle or at higher rpm, on both banks or just one bank. just because the dtc is setting for only one bank, doesn't mean the other bank isnt lean also...check with the scan tool.
if both banks are lean all the time, check fuel pressure. if its only lean at idle, you have a vacuum leak.