What does code P0174 mean on a Acura and is it safe to drive?
P0174: System Too Lean (Bank 2). Here's what it means on your Acura, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainMedium urgency
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 for your 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 Acura, repairs for P0174 often fall between $100 and $600, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
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