What does code P0174 mean on a Toyota and is it safe to drive?
P0174: System Too Lean (Bank 2). Here's what it means on your Toyota, what usually causes it, what repairs typically cost, and how safe it is 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 for your Toyota
- 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 Toyota, 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 Toyota
P0174 on Toyota V6 models often appears alongside P0171. If both codes are present simultaneously, a vacuum leak affecting both banks—like a large intake manifold leak—is the most likely cause.
Most commonly affected models
Camry V6 2002–2011Sienna 2004–2010RAV4 V6 2006–2012