What causes P1387 on a Honda?

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 do I fix P1387 on a Honda?

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

P1387 Cylinder Position Sensor Intermittent Interruption

Q: What does P1387 mean on a Honda?

P1387 — Cylinder Position Sensor Intermittent Interruption. Applies to Civic, Accord, Integra with distributor-mounted CYP sensors.

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: Civic, Accord, Integra with distributor-mounted CYP sensors

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