Is it possible to have codes P1151 and P1152 at the same time ? I've read that you should check for vacum leaks before repalceing sensors...true ?

 

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Welcome to the forum

A P1151 indicates a lean mixture and the P1152 indicates rich. Normally if you have just one of the codes you would suspect a vacuum leak, fuel pressure problem etc.
Since you have both codes it's probably fairly safe to assume the sensor is bad.
Of course we all know what happens when we assume though

 

Contradictory O2 codes almost always indicate the senmsor is shot.

Replace it.

Steve

 

I agree with Steve replace the O2 sensors.

Lance