P1201 – Injector Circuit Malfunction (Cylinder 1, Nissan)

Description

The ECM detected an injector circuit malfunction on cylinder 1.

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Symptoms

Misfire
Rough idle
Poor acceleration
Check engine light

Causes

Faulty injector
Open/short wiring
Connector corrosion
ECM driver fault

Diagnosis

Check injector pulse
Inspect wiring
Test injector resistance

Repair

Replace injector
Repair wiring
Clean connectors