p0174
Moderate
Toyota · SUVs
System Too Lean Bank 2
Quick Answer
Error code P0174 on your Toyota SUVs means: System Too Lean Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
4Runner TRD Pro 2024Grand Highlander Limited 2024Highlander XLE 2024Highlander Hybrid Bronze Edition 2023Land Cruiser 1958 Edition 2024RAV4 XLE Premium 2024RAV4 Hybrid SE 2024Sequoia Capstone 20244Runner Limited 20244Runner SR5 20244Runner TRD Off-Road 2024Grand Highlander Platinum 2024Grand Highlander XLE 2024Highlander LE 2024Highlander Limited 2024Highlander Platinum 2024RAV4 Adventure 2024RAV4 LE 2024RAV4 TRD Off-Road 2024RAV4 XLE 2024Sequoia Limited 2024Sequoia Platinum 2024Sequoia SR5 2024Sequoia TRD Pro 2024Venza Limited 2024
Likely Causes
How to Fix It
1
Inspect the Bank 2 side of the intake manifold for vacuum leaks using a smoke machine
2
Clean or replace the MAF sensor and verify fuel trims normalize
3
Test fuel injectors on Bank 2 cylinders for flow rate and spray pattern
4
Inspect the PCV valve and hose for proper operation
5
Check the intake plenum gasket for leaks, especially on V6 models
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
MAF sensor
Intake manifold gasket set
Fuel injectors
PCV valve
Related Error Codes