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When performing work that requires complete draining of the liquid from the cooling system, be sure to flush the system with clean water, blow with compressed air to remove residual water

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Put the car on a two-post lift

Disconnect the battery.

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Heated oxygen sensors

Heated oxygen sensors are switched on by the ECU under the following conditions:

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Remove

Disconnect the wires from the battery terminals, starting with the negative terminal

Remove the intake manifold

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Checking the operation of the vacuum booster

Release the existing vacuum with the engine off by depressing the brake pedal several times at 5-second intervals