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Section 21 (Engine Control System (Diagnostics) - Introduction): General Description: Preparation Tool: Other

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
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Oscilloscope Used for measuring the sensor.
General scan tool (SAE J1978) Used for troubleshooting the electrical system.
Circuit tester Used for measuring resistance, voltage and current.