2010 5.3L oil sensor/sending unit

CEL came up with codes P0521, P0523. Reader analyzer showed 130 psi with engine running or ignition switch in accessory. Sensor is high on back of engine accessible on drivers side behind a piece of plastic (sound proofing). Some cut the plastic to make sensor more accessible. I removed the vapor return lines and fuel line before attempting. Need 1-1/16" deep socket; preferably 6 sided 3/8 drive with u joint and wobble extension. Not fun, but do-able. New sensor read 55 psi at idle.