Powertrain
generic / SAE
P0174
System Too Lean (Bank 2)
Same condition as P0171 but on bank 2 of a multi-bank engine (V6, V8, flat-six, etc.). When P0171 and P0174 appear together, the cause is usually a shared component such as the MAF sensor or a central vacuum leak rather than a bank-specific fault.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 74
Possible causes
- Central vacuum leak (intake manifold gasket, brake booster) high
- MAF sensor contaminated high
- Fuel pressure low (affects both banks) medium
Symptoms
- Check engine light on
- Rough idle, possible stalling
- Hesitation or hard cold start
- Power loss under load
Inspection / repair
- Difficulty: medium
- DIY: possible
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References
sae:J2012