What does code P0174 mean on a Lexus and is it safe to drive?
P0174: System Too Lean (Bank 2). Here's what it means on your Lexus, 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 Lexus
- 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 Lexus, 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 Lexus
Lexus 2GR P0174 Bank 2 lean is typically a failed MAF sensor or a vacuum leak. These engines are reliable and genuine vacuum leaks are uncommon. A contaminated MAF sensor from PCV oil residue is the more frequent cause—clean the MAF sensor before testing for leaks.
Most commonly affected models
RX350 2GR-FE 2007–2015ES350 2GR-FE 2007–2012GS350 2GR-FSE 2007–2011