2005 Hyundai Tuscon PO133

WALLYR

MEMBER
2005 HYUNDAI TUCSON
2.0L
4 CYL
2WD
AUTOMATIC
100,000 MILES

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.

1 Reply

HMAC300

MECHANIC
48,601 POSTS

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

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Saturday, February 22nd, 2014 AT 6:03 AM