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Pᴀᴜʟsᴛᴇʀ2
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That’s a pre-cat O2 sensor exhaust leak sucking in air doingduring valve overlap.

That’s a pre O2 sensor exhaust leak sucking in air doing valve overlap.

That’s a pre-cat O2 sensor exhaust leak sucking in air during valve overlap.

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That’s a pre O2 sensor exhaust leak sucking in air doing valve overlap.