The Ultimate Guide to Engine Code P0171 From Novice to Expert

P0171 is a "System too lean" error code. This is caused by the engine receiving more air than fuel so it compensates by adding more fuel ... Recently I was driving my car home from a 2hr road trip when my "Check Engine" Light came on. The code that popped up said that my system was ... P0171 means the computer is correcting for a lean condition on bank 1 (the rear bank.) A lean condition can be caused by any number of things. Chevy / GM P0171 or P0174 System To Lean Bank 1 Bank 2 · Check Engine Light? · Engine Fault Code P0171 - System Too Lean Bank 1! · P0171 Trouble ... P0171 almost always points to a vac leak. Clamp the line to the bleeder valve under the intake. It's a very common failure. That's a lean code. Any unmetered air that gets in the system can cause that as well as low fuel pressure. If your canister hose was loose ... The surging rpms sound like the plastic hose from the intake to the turbo has a vacuum leak. Check both ends for fitness and take a good look at the hose. For More Info visit us at: http://1aau.to/h/cnF/ Is your car or truck suffering from a weak or hesitating engine? The engine seems to be running really rich (can smell a lot of gas at startup). I've checked for exhaust leaks, did my best to check for a vacuum leak, and ... When the code says that the fuel system is "too lean," it means that the computer has been adding more and more fuel, which is called Long Term Fuel Trim.