2012 Acura P0174: What It Means & Is It Safe to Drive?
P0174 on the 2012 Acura: System Too Lean (Bank 2). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
Same as P0171 but for bank 2. The engine is running too lean on the side that contains cylinder 2.
Common causes on the 2012 Acura
- Vacuum leaks affecting bank 2
- Faulty MAF or O2 sensor
- Fuel delivery issues
Symptoms
- Check Engine Light
- Rough idle, hesitation
- May appear with P0171 on V6/V8 engines
Typical fixes
- Smoke test for vacuum leaks
- Inspect intake gaskets and hoses
- Check fuel pressure and filter
Repair cost range
For a 2012 Acura, repairs for P0174 typically fall between $100 and $600, depending on the root cause and labor rates in your area.
Known issues on Acura
Acura J35/J37 V6 P0174 Bank 2 lean is typically a dirty MAF sensor or a vacuum leak. On high-mileage TL and MDX, the PCV valve can allow oil vapor to coat the MAF sensor element. Clean the MAF first—this resolves the majority of P0174 cases on these engines.
Most commonly affected models
TL J35Z 2004–2008MDX J35Z 2003–2006RL J37A1 2005–2012