2001 Lexus IS 300 Trouble codes

Tiny
PHILIP_INO
  • MEMBER
  • 2001 LEXUS IS 300
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
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?
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Wednesday, November 5th, 2008 AT 12:10 PM

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Tiny
KHLOW2008
  • EXPERT
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.
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Wednesday, November 5th, 2008 AT 1:03 PM

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