Unraveling the Puzzle Engine Code P0171 and Fuel System Mastery

The answer appears to be: If it is not a vacuum leak then the MAF - Mass Air Flow Sensor or A/F Air/Fuel Sensor if there is a P1135 error code also! 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 ... Is your valve cover leaking? If so could be spilling oil on the O2 sensor. If it's leaking, you probably have a bad PCV valve as well. 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 reading is too lean (i.e. too much air or not enough fuel). P0171 is a bank one reading lean, P0172 is for bank two reading lean. If the PCM is saying is ... 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. The PCV will emit a loud sucking sound when the engine is running on idle. It is relieved by removing the oil dip stick. It's very possible that you do have a vacuum leak. The only real way to find out is to get a hold of a scanner that you can monitor the O2< ... Code P0171 stands for “System Too Lean (Bank 1)”. This diagnostic trouble code can happen for a number of reasons related to combustion inside your engine. The ... The P0171 error code indicates the engine is running lean. The powertrain control module (PCM) monitors the oxygen content of the exhaust post-combustion.

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