HomeBrandsMercedes-BenzSedansp0174
M
p0174
Moderate
Mercedes-Benz · Sedans
System Too Lean Bank 2
Quick Answer
Error code P0174 on your Mercedes-Benz Sedans means: System Too Lean Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
W177W206W214V297A220 2024A220 4MATIC 2024AMG A35 4MATIC 2024AMG C43 4MATIC 2024AMG C63 S 2024AMG E53 4MATIC+ 2024AMG E63 S 2024AMG EQS 53 2024AMG S63 E 2024C300 2024C300 4MATIC 2024E350 4MATIC 2024E450 4MATIC 2024EQS 450+ 2024EQS 580 4MATIC 2024Maybach S580 2024S500 4MATIC 2024S580 4MATIC 2024W223
Likely Causes
  1. Vacuum leak on the passenger side of the intake manifold
  2. Faulty mass air flow (MAF) sensor giving incorrect readings
  3. Low fuel pressure from a weak fuel pump or clogged filter
  4. Cracked or deteriorated intake boot
How to Fix It
1
Scan for related codes such as P0171 to determine if both banks are affected
2
Perform a smoke test on the intake system focusing on Bank 2 side
3
Inspect and clean the MAF sensor with approved MAF cleaner
4
Test fuel pressure at the rail and compare to factory specifications
5
Check for cracked intake boots or worn gaskets on the Bank 2 side
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 boot
Intake manifold gasket
Fuel pump
Related Error Codes
P0171P0300P0410P0420P0455
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