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K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Lexus
Satisfied Customers: 2514
Experience:  AA in automotive Technology, 15+ years in the trade
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How can I solve this problem

Customer Question

How can I solve this problem
Submitted: 9 months ago.
Category: Lexus
Expert:  K. Wiggins replied 9 months ago.

Hello, what is the problem you are experiencing? Is the check engine light on and if so have you retrieved any diagnostic codes?

Customer: replied 9 months ago.
Codes 0171&0174 . Already replace mass air flow. Tried another good part and can't figure it out
Expert:  K. Wiggins replied 9 months ago.

Thanks, 171&174 mean it's running lean on both banks. I'm going to post the whole of the troubleshooting info below but here is what I sugest starting with checking.

  • Intake boot to throttle body for any tears,rips or cracks
  • Exhaust pipes for any leakage
  • Fuel pressure (most common) it should be 44-50PSI at idle and hold at least 21PSI for 5 minutes after turning off.

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