Diagnostic Excellence Engine Code P0171 and Fuel System Perfection

P0171 and P0174 are codes for a lean condition. This is usually caused by a vacuum leak. Sometimes it is caused by a faulty oxygen sensor, but ... P0171 is for a lean mixture. The O2 sensor is detecting too much air/oxygen. This causes engine computer to open the injectors to stay open longer to add more ... The check engine code was P0171, a lean fuel trim. He cleared the code and checked for air leaks and said the car needed a new PCV valve and he installed one. Engine Fault Code P0171 - System Too Lean Bank 1! [Symptoms, Causes, and Fixes] · Comments133. A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty. 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 ECM has the power to adjust the amount of fuel injected if an increase in the amount of air being fed into the engine is detected. However, ... The lean code P0171 is in most cases set due to eaither a vacuum leak in and around the intake and or in most cases if you dont have a vacuum leak, its usually ... This code is mostly caused by a vacuum leak. The intake manifold is most likely the cause, especially on this engine. 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< ...

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