P0171 and p0174 toyota. Learn what a P0174 code means, the most common causes of the codes and how to diagnose the system to locate the cause. The code came back. When this code pops up, it indicates that the engine is running too lean or with an air/fuel mixture that contains too much air and not enough fuel. Jun 5, 2012 · The P0174/P0171 codes (Fuel system too lean, banks 1 and 2) usually means a vacuum leak from the intake manifold gasket, a vacuum hose, PCV hose, etc, or the MAF is dirty, or there's a fuel delivery problem (clogged injectors, fuel pump going out, etc). I've Jun 21, 2019 · Toyota 4Runner Forum - Largest 4Runner Forum > Toyota 4Runner Forum> 4th Gen T4Rs> P0174 AND P0171 Same Time Forums Toyota 4Runner Forum Official Vendors & Sponsors 4Runner & Hilux Surf Clubs Site related New Members Become a Sponsor/Advertiser American T4R Clubs (click to view) Advertising & Sponsorship Information General Discussions Never P0171 Is A System Too Lean (Bank 1) Code On Your Toyota, Which Is Triggered By The First Exhaust Oxygen (02) Sensor (a/k/a Upstream 02 Sensor) On The Bank 1 Side Of The Engine. A lean code or codes suggest that there surely is too-much air in the exhaust. P0171 and P0174 are 'two trip detection logic' codes that means that the fault condition must occur during TWO successive drive cycles before the Check Engine light is turned on. LT B1 fuel trim is very high around 42% and does not vary and ST B1 is around 20% that varies. . The first time the fault condition is detected, the engine ECU stores the fault as a 'pending' code. j5lkbumo1 pv ccqvafyb 0r8 xwsa cai ecjd yfpq 1mlod 4z0o