2018 Toyota Tacoma 4dr XP edition w/3.5L V6
My wife's Tacoma is throwing codes like every 2-3days with Lean bank 1 & Lean bank 2. Have changed MAS, did not work. This 2018 Tacoma has only 22,876 miles on it. The extended warranty just ran out on 10-30-2023. Nobody knows what the problem is. My buddy owns a shop and plugged into computer and it just showed Lean bank 1,2 with no cause shown. Help please otherwise my wife wants to trade it in.
Bob W.
Both codes indicate you have a lean mixture meaning too much air or not enough fuel.
See below: same as for P0174; you will have to methodically go through each one including checking for vacuum leaks (perform a smoke test) as well as checking the fuel filter and a fuel pressure test. Scotty has videos on this if you search his YouTube channel.
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https://www.obd-codes.com/p0171
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My buddy owns a shop and plugged into computer and it just showed Lean bank 1,2 with no cause shown
That’s it? They didn’t even bother troubleshooting? Find a competent shop if you can’t perform the troubleshooting yourself.
