2020 Audi S4 - Pcv Failure Again Valve Explained What It Does Signs Of And How To Replace

Author Dalbo 08 Jun 2026

The pcv failed on my rs5 about a year after i bought it If this is failing, you can experience numerous symptoms,. No symptoms, just a yellow check engine light

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2020 Audi S4 - Pcv Failure Again Valve Explained What It Does Signs Of And How To Replace

I scanned it with vcds and noticed some pcv error codes Audi s4 b8 and b8.5 3.0t engines feature a crankcase ventilation system, commonly referred to as the pcv, crankcase breather, or air/oil separator The car continued to drive.

Replacing the pcv (or air oil separator) on a b8 audi s4 isn't a difficult job, it just requires a lot of steps

Our diy guide covers from start to finish. Howdy, i’m just wondering what i should do cuz i have a sneaking suspicion the pcv is failing or just about to fail Oil consumption not atrocious i’ve only have to fill up just about a quart the last 5kish. Learn how a failing pcv valve (oil separator) affects audi and volkswagen engines and what to do before damage spreads.

In this video, we review the symptoms of a failed pcv breather hose on the factory b9/b9.5 ea839 3.0t equipped s4, s5, & sq5 This hose fails on stock & tuned vehicles. It seems to be a common failure Having said that, i replaced ours at 170k miles when i did the water pump, thermostat, carbon cleaning

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It's relatively inexpensive and easy to.

The pcv is located on top of the cylinder head, so it's pretty accessible, and you don't need any specialty tools to replace it, making it a straightforward process. A malfunctioning pcv system can lead to several problems, including increased oil consumption, reduced fuel efficiency, rough idling, and potential engine component damage. A common failure point on earlier ea888 engines, it's better on the gen 3 engine, but not perfect As such, there's a good chance you'll have to replace the pcv on a higher mileage b9 a4 or a5.

Now on the b nines five the pcv issue is caused by the breather hose where the internal check system or diaphragm fails to regulate the crank case pressure leading to failure If it’s a b8.5, that’s not a pcv failure code That’s a code for the valve failing on the pcv which goes to the intake tube right before the tb on the back side Replace that hose assembly with the.