The engine air-oil separator is an emissions device located on the top right rear corner of the engine. The separator is responsible for collecting residual gases and vapors contained inside the crankcase and funneling them back into the intake manifold where they can be burned in the combustion chamber. This reduces the overall emissions of the engine.

When the separator fails:
- Large increase in the overall vacuum in the engine crankcase
- Oil is sucked into the intake manifold and can foul spark plugs and destroy catalytic converters

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Refer to our step-by-step DIY article HERE