Mechanics

02 SENSOR PROBLEMS ON

2000 Ford Expedition • 173,000 miles

2000 Ford Expedition XLT 5.4 Liter 173,000
Started to idle rough about a week ago.
Sitting at stop light almost stalled out. Rpms then shot up and the service engine soon light came on.
Pulled these codes at AutoZone
P2272, P2273, P0156, P1131, P1151 All 02 sensor codes.
Will 02 sensors cause such a rough idle? And is it normal that all these codes will happen at once? The first two seem to contradict each other, one stuck rich and one stuck lean.
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Blasterunk93
January 14, 2012.



Possibly a clogged cat, the pre cat 02 sensor would read rich and the post cat would read lean in this case. And it would run like crap with poor exhaust flow. That's all I got so far.

ProAutoTech
Jan 14, 2012.
Turned out it was a disconected PCV valve. Plugged it back into the manifold and viola.

Tiny
Blasterunk93
Jan 14, 2012.
That's it? Crazy

ProAutoTech
Jan 15, 2012.