P1387 Cylinder Position Sensor Intermittent Interruption
This fault is part of the Honda misfire codes guide. It covers the system and the order to check it.
What does P1387 mean on a Honda?
P1387. Cylinder Position Sensor Intermittent Interruption. This Honda-enhanced code applies to Civic, Accord, Integra with distributor-mounted CYP sensors.
Common causes of P1387
- Distributor-internal cylinder position sensor with an intermittent open
- Worn distributor shaft bearing disturbing the sensor air gap
- Failing alternator diode backfeeding electrical noise into the sensor circuit
- Corroded distributor connector breaking contact intermittently
- Oil leaking into the distributor from a failed shaft seal
How to fix P1387
- Load-test the alternator first, a bad diode is a documented false trigger of this code
- Wiggle-test the distributor harness while scoping the CYP signal
- Inspect for oil inside the distributor and check shaft play
- Check connector pins for corrosion and spread terminals
- Replace the distributor assembly after alternator and wiring exclusion
Sources and review
- Last updated 2026-09-07.