engine codes

1999 CHEVROLET SUBURBAN
98,000 MILES • V8 • 4WD • AUTOMATIC
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CFORER
  • MEMBER
  • 1 POST
What should I look for when codes PO159 and PO174 come up?
Jul 30, 2011 at 8:03 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
Any driveability issues? How long since a tune-up? Use a gage and check fuel pressure. P0159 isn't listed for v8, means insufficient activity for 02 sensor. P0174 says bank two is lean.
Jul 30, 2011 at 8:18 PM
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