On the 2002 Honda Accord with the 2.3L engine, the P1381 is a fairly straight forward code pointing to a fault with the Cylinder Position Sensor. This sensor is built into a part of the Distributor Assembly. Carefully inspect the electrical connector and wire harness to the distributor for any loose, broken or damaged wires. Inspect the spark plug wires and make sure they are in good condition (no chips, tears, stretched out, etc..). If these all check ok, the Distributor Assembly will need to be replaced.
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