P1346 – VVT Sensor Range/Performance (Toyota)

Description

The ECM detected incorrect camshaft timing or VVT sensor performance outside the expected range.

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Symptoms

Rough idle
Engine shaking
Poor acceleration
Hesitation
Check engine light

Causes

Incorrect cam timing
Faulty VVT sensor
Stuck OCV valve
Low oil pressure
Timing chain stretch

Diagnosis

Check cam timing
Test VVT sensor
Inspect OCV valve
Measure oil pressure
Scan VVT data

Repair

Repair cam timing
Replace VVT sensor
Replace OCV valve
Restore oil pressure