P0174 — System Too Lean (Bank 2)
Reviewed1 source
1 source
- Official data (NHTSA)official_feed
What P0174 means
Caution — monitor closely
Same as P0171 but for the second cylinder bank — often paired with P0171, pointing to a shared root cause (MAF, fuel pressure, a shared vacuum leak).
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Vacuum leak (shared with bank 1)
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