2001 Lexus IS 300 Trouble codes

2001 LEXUS IS 300
120,000 MILES • 6 CYL • 2WD • AUTOMATIC
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PHILIP_INO
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my check engine light keeps coming on. it gives me code p0174 and p0171 indicating that bank 1 and bank 2 is running too lean. does this mean there's a vacuum leak, if so where should i start looking for the problem?
Nov 5, 2008 at 12:10 PM
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KHLOW2008
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Hi philip_ino,

Thank you for the donation.

Yes, it could be a vacumn leakage and you need to check all the hoses at the manifolds. Is the idling rpm stable?

The other possible cause is the fuel filter, if it is clogged, the fuel supplied would be lean.
Nov 5, 2008 at 1:03 PM