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In my Opel Astra G selection 1.4 I found a blue plug connection, what might be its use?

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It's near the air filter.

  • It is to operate that component at the required times. – Solar Mike May 19 at 18:30
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It's a solenoid which is used to provide vacuum to a component. There are usually two things I've seen it used for:

  1. Exhaust Gas Recirculation (EGR) valve activation
  2. EVAP canister activation

I don't know which it's used for in your vehicle. You'd have to track the lines in both directions and see where it leads to.

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