The Ultimate Guide to Engine Code P0171 Unlocking the Secrets

a problem with the AF sensor · a small error in estimation at the ECU of when air should be passing the AF sensor from each bank · injectors that ... 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 ... P0171 is a lean code caused by a vacuum leak, mass airflow failure, faulty PCV valve, or low fuel pressure. I would start by checking all of the ... 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. For example, code P0170 could mean the right cyl. bank could be running either lean or rich and the same for code P0173. They want you to read ... I was able to get enough gas to get to a decent gas station to fill the tank. On my way home I got a check engine light and the code was P0171( ... The DTC indicates that the oxygen sensor on the first cylinder bank has detected lean engine conditions. This means that there is too much air or not enough ... p0171 code (lean bank 1) ... The O2 sensor only cuts in (closed loop with ECM) once the engine has warmed up and coolant temp has exceeded 158F/ ... Your vehicle may get the P0171 code due to dirty sensors or a faulty fuel pump. Specifically, mass airflow sensors are known to trigger this error code, as this ... 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.