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2000 rx: gas, the check engine light came on..diagnostic..o2 sensor…

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Just bought used 2000 rx...
Just bought used 2000 rx 300 with 120K miles, and hours after first fill up with gas, the check engine light came on. Free diagnostic came up with code P0171B. Mechanic says it needs O2 sensor replaced -- about $350..... Coincidence, or could the gas have something to do with this? Do I really need to do this repair now? MZ
Submitted: 8 years ago.Category: Lexus
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Answered in 20 minutes by:
6/10/2010
Lexus Mechanic: Tom, ASE Certified Technician replied 8 years ago
Tom
Tom, ASE Certified Technician
Category: Lexus
Satisfied Customers: 26,066
Experience: ASE Certified Master Technician qualified to work on all makes and models.
Verified
You need to check the mass air flow sensor to make sure it is not contaminated. This is the most common problem. Obviously make sure there are no vacuum leaks. The second most common issue is restricted injectors. The MAF some times can be cleaned.

Hoped this helped.

Positive feedback and bonuses greatly appreciated.

Edited by Cardoctor 74 on 6/10/2010 at 10:52 PM EST
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