The Ultimate Engine Code P0171 Troubleshooting Guide Step-by-Step Solutions

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 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 ... Engine Fault Code P0171 - System Too Lean Bank 1! [Symptoms, Causes, and Fixes] · Comments133. Your problem is more than likely an air leak. That code means you are running lean period. There is only one bank...so disregard the idea of a bank two. 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 ... In the most literal sense, the P0171 code means “System Too Lean (Bank 1).” This trouble code points to a lean running engine condition on the ... 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 ... Based on the information you provided, it seems like your vehicle is displaying a P0171 error code, which typically indicates a problem with the ... The P0171 code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the... The P0171 engine code is serious—it means that your engine is running too lean in bank 1. Understanding the cause of a P0171 engine code can ...