Empower Your Engine A Comprehensive Breakdown of Engine Code P0171

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 ... PCM & Fuel Systems - Engine Code P0171 - #P0171- According to the book it means System adaptive feul too lean (bank 1) . the same lean code on both banks indicates it is a fault that affects the whole engine, so less likely to be an O2 sensor. I would take another ... 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 and 174 are related to the injectors on Banks 1 & 2 reporting a lean condition, meaning they aren't supplying enough fuel. A faulty MAF ... code says the o2 sensor is reading too much oxygen ( ie not enough fuel to use up the alotted air). ... When you say you have an 80 mile range - ... code issue is lean condition bank 1 I replaced PCV valve and hose. I cleaned MAP sensor. I installed a hose clamp on passenger side vacuum ... A quick search says possible causes dirty air filter, intake leak, mass airflow sensor, or oxygen sensor, among other things. 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 is a code indicating that the engine is experiencing a leaner fuel mixture than what's commanded (too much air or not enough gasoline).