P0174: System Too Lean (Bank 2)

Same as P0171 but on the other engine bank.

Medium Severity

$50 – $800

Typical repair cost range

Get Estimate for My Car

Can I Keep Driving with Code P0174?

Yes briefly, but address the underlying cause to avoid engine and cat damage.

What P0174 Means

On V6 and V8 engines, the computer monitors each cylinder bank separately. P0174 is the bank 2 version of P0171. If both P0171 and P0174 appear together, the cause is something affecting both banks (vacuum leak, fuel delivery).

Common Causes

Vacuum leak (look at PCV system, intake gaskets)
Dirty MAF sensor — see repair cost
Weak fuel pump — see repair cost
Failing O2 sensor on bank 2 — see repair cost

Diagnostic Tips

If both banks show lean, focus on root cause not the sensor.
Common on Ford F-150 and Explorer due to PCV elbow cracks.

Skip the Guesswork

Get an AI estimate for the most likely repair on your exact car, in under a minute. No account required.

Get My Free Estimate

Frequently Asked Questions

Why only bank 2?

If only one bank shows lean, the cause is local to that side: O2 sensor, exhaust leak, or one bad injector.