P0174Severity: Medium
P0174 – System Too Lean (Bank 2)
The mixture is too lean on the bank 2 side.
What it means
Same condition as P0171 but for the second cylinder bank (bank 2). If both banks are lean, a shared leak or MAF issue is likely.
Symptoms
- Rough idle
- Loss of power
- Misfire
- Increased fuel use
Common causes
- Intake/vacuum leak
- Dirty MAF sensor
- Weak fuel pressure
- PCV leak
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Frequently asked questions
What does trouble code P0174 mean?
P0174 – System Too Lean (Bank 2). Same condition as P0171 but for the second cylinder bank (bank 2). If both banks are lean, a shared leak or MAF issue is likely.
Can I drive with a P0174 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.