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L
p0174
Moderate
Lexus · SUVs
System Too Lean (Bank 2)
Quick Answer
Error code P0174 on your Lexus SUVs means: System Too Lean (Bank 2). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
GX550LX600NX250NX350NX350hNX450hplusRX350RX350hRX500hRZ450eTX350TX500hUX250h
Likely Causes
  1. Faulty oxygen sensor
  2. Vacuum leak in intake system
  3. Fuel pressure regulator failure
  4. Dirty mass air flow sensor
  5. Engine timing issues
How to Fix It
1
Scan vehicle with OBD-II diagnostic tool
2
Check fuel pressure at fuel rail
3
Inspect oxygen sensor function
4
Perform smoke test for vacuum leaks
5
Verify engine timing with timing light
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Related Error Codes
P0171P0300P0420P0430P0441
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