Official TN Member
Join Date: Mar 2011
Location: Treasure Coast, FL
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 52 Post(s)
Thanked 51 Times in 47 Posts
iTrader Score: 0 reviews
P0171 bank 1 lean
Truck in sig. So, I have had this code now for about a year. "P0171 bank 1 lean". I cleared it once and a few days later it came back (this was about 8 months ago).
Yesterday I took it upon myself to try and figure out if it was a MAF or O2 sensor problem. I pulled the MAF out, looked for leaks, check vacuum lines, checked for cracked filter box, etc. None found and airbox is only a couple years old, so I knew it was not that.
Anyway... So, after cleaning the MAF, getting everything back together and clearing the code again, the truck runs much better and the light has not come back on this time. However, now when the truck is cold (first start of the day) the RPM's stay at a high idle for a long time at around 1400 RPM. I don't remember it ever doing this before? Is this normal? Once I put in in gear and drive off after only a minute or so everything is normal and idle is down where it normally is at around 700 RPM if I stop and put it in Park again.
Any thoughts? Or normal operation? The check engine light has been on for so long I have forgotten these little things. I still can't believe how much better it runs...
2008 TCH Magnetic Grey on Black
1999 Tacoma Prerunner SR5 V6/auto White on Oak