The CYP sensor is in the distributor. The P1381 code is a problem with the signal from the CYP sensor to the computer. The real problem can be the CYP sensor, the wiring, or the computer.
The sensor in the distributor is more likely, but you can do some electrical tests to isolate the problem. If you unplug the 5-pin electrical connector to the distributor, measure the resistance on the distributor side of the connection between the yellow and black wire.
The wires are numbered 1-5.
The 4 and 5 should be the two wires you want to test. The resistance should be 0.8-1.5 kOhms.
Let us know what you find.
2005 Acura TSX MT