2005 Hyundai Tuscon PO133

2005 HYUNDAI TUCSON
100,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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WALLYR
  • MEMBER
  • 1 POST
Since a couple of months ago the check engine light came on, with the code PO133 which indicates that the O2 sensor 1 is responding too slow. I already have replaced the O2 sensor 3 times, the last attempt was with and genuine sensor (OEM), but the light came back on again after a few miles traveled. Then I ran the ECM on a virtual engine, and everything in it is OK.
There are no visible exhaust leaks, all the cables look new. Sparking plugs are fine.
Feb 21, 2014 at 12:00 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check your fuel pressure it may be low also it can be a vacuum leak/exhaust leak to much resistance in connectors and contaminated O2 sensor. fuel pressure 49.8 psi no lower
Feb 22, 2014 at 6:03 AM
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