2001 Lexus GS 300

2001 LEXUS GS 300
92,000 MILES • 6 CYL • 2WD • AUTOMATIC
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BOBN60
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check engine lite on, codes 0171,0172, come uo, lean fuel at O2 sensor banks 1,2 , checked for air leaks at intake,none, repaced the coolant temp.sensor, al with no resolve. Went to highest octaine fuel codes come back, any suggestions?
Jan 28, 2008 at 6:19 PM
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LOSTINMARS
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i'm curious as to why the coolant temp sensor was replaced???

assuming there are no vacuum or air leaks, i'd go with an airflow meter. common on yotas
Jan 28, 2008 at 8:30 PM