2008 Audi P0174: What It Means & Is It Safe to Drive?
P0174 on the 2008 Audi: 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 2008 Audi
- 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 2008 Audi, repairs for P0174 typically fall between $100 and $600, depending on the root cause and labor rates in your area.
Known issues on Audi
Audi V6/V8 P0174 Bank 2 lean is typically a failed MAF sensor or a vacuum leak at the intake manifold. On the 3.0T supercharged V6, an intercooler bypass hose can crack and cause a lean condition on Bank 2. Smoke test the charge air system alongside the intake manifold.
Most commonly affected models
A6 3.0T TFSI C7 2012–2018Q7 3.0T 2010–2015A8 4.2L V8 2011–2018