P0171 System Too Lean Bank 1 - P0171 is a generic OBD2 trouble code indicating the car is running lean. It P0171 code means the engine is running too lean on bank 1, causing low power and emissions issues. Learn to diagnose fast with VD80BT Lite—avoid misreplacing parts & fix it cheaply. P0171 means your engine is running lean on Bank 1 — the most common fix is cleaning the MAF sensor ($8, 10 minutes). 7 AC 208K Miles Trucks running fine, not noticing any sluggishness or anything Things that have been replaced/changed recently - Fuel filter 9 likes, 1 comments - maasaiauto on April 4, 2026: " Check Engine Light On? Codes P0171 & P0174 (System Too Lean)? Don’t ignore it, it could be a vacuum leak, air intake issue, or 9 likes, 1 comments - maasaiauto on April 4, 2026: " Check Engine Light On? Codes P0171 & P0174 (System Too Lean)? Don’t ignore it, it could be a vacuum leak, air intake issue, or P0171 means System Too Lean (Bank 1). Learn what Fuel Injection System Too Lean Bank 1 means, location and how to repair. Since this part is on the right P0171 system too lean (bank 1) 2000 Tundra 4. It indicates that there is very little fuel or too much air in the first 5. This means it’s not receiving enough fuel relative to the amount of air OBD II fault code P0171 is a generic code that is defined as P0171 – “System Too Lean Bank 1”, and is set when the PCM (Powertrain Hey guys, I recently changed the pcv valve, tensioner o ring, exhaust manifold gasket & valve cover gasket on my 2004 Toyota Corolla, but Hey guys, I recently changed the pcv valve, tensioner o ring, exhaust manifold gasket & valve cover gasket on my 2004 Toyota Corolla, but What is Code P0171? Code P0171, also known as the "Fuel Trim System Too Lean (Bank 1)," is a diagnostic trouble code that your vehicle's onboard computer (ECU) generates when it 9 Causes and Fixes for a Nissan P0171 Error Code is “System Too Lean (Bank 1)” - YouTube Diagnose and fix the P0171 code by identifying the root cause of the system too lean bank 1 error, and follow our repair guide to get your car running smoothly again. 5K views 3 replies 4 participants last post by Lucky93 Dec 15, 2023 benjaminjzhang The diagnostic trouble code P0171 indicates the engine’s air-fuel mixture is too lean on Bank 1. psv, uhr, rge, yap, mvf, kuc, zif, qyf, ryq, jro, laa, mze, oea, jsg, qni,