Whistle at idle, a lean code and an oil cap that fights back? Your Audi 3.0T PCV valve replacement is coming, and there's a catch: on the EA837 engine the valve lives under the supercharger. The part is cheap. Getting to it is not. That's why the smart move is to replace the PCV valve and everything else in the valley in one shot with a Vorsprung Audi 3.0T under supercharger kit, which includes the correct OE PCV valve for your engine. Pull the blower once, fix it all, and keep the Audi Tax in your wallet.
Why the Audi 3.0T PCV Valve Fails
The PCV (positive crankcase ventilation) valve on the EA837 is an oil separator with a rubber pressure-regulating diaphragm. It sits at the back of the engine valley in constant heat. Over time the diaphragm hardens or tears and the plastic body gets brittle. Once it stops regulating, the engine either sucks in unmetered air or builds crankcase pressure.
Common symptoms include:
- ✅ A whistle or squeal at idle
- ✅ A rough or hunting idle
- ✅ Lean or fuel trim codes, or PCV regulator code P052E
- ✅ Rising oil consumption
- ✅ An oil cap that is hard to pull off with the engine running
Want to prove the diagnosis before you buy anything? Our Audi PCV valve symptoms and testing guide covers it step by step. And if the leak turns out to be the hose rather than the valve, see the PCV breather hose guide.
What an Audi 3.0T PCV Valve Replacement Really Costs
Independent shops commonly quote roughly $600 to $900 for the PCV valve alone on a B8 or B8.5 S4, with 3 to 5 hours of labor. Owners on the forums report dealer quotes in the same range. Most of that money goes to one thing: removing and reinstalling the supercharger.
Here's the problem. The thermostat housing, water pump, heater pipe and intake gaskets live in the same valley, and most of them are plastic or rubber the same age as your PCV valve. Replace only the PCV today, and there's a good chance you pay for the same supercharger removal again when the thermostat housing or water pump lets go. Why pay that labor bill twice?
PCV Valve Only vs Full Under Supercharger Kit
If the blower is coming off anyway, here's what to look for in the parts you put back:
- ✅ The right PCV part number for your engine. The 3.0T used four different valves (AC, AH, AK and AF). The wrong one won't fix your problem.
- ✅ OE-supplier quality. Hengst made the factory valve. That's the standard to match.
- ✅ A new PCV-to-supercharger vent tube. Its O-rings harden too, and you have to disturb it anyway.
- ✅ Fresh intake manifold gaskets and injector seals, so nothing leaks after reassembly.
- ✅ The plastic cooling parts replaced while you're in there: thermostat housing, water pump and heater pipe.
Vorsprung Kit vs Name-Brand Kits vs PCV-Only Kits
In short: our B8.5 under supercharger kit is $649.99 and includes the Hengst OE PCV valve plus the billet thermostat housing and thermostat, Graf metal water pump, aluminum heater pipe, Elring upper and lower intake gaskets, the genuine PCV vent tube and Elring injector seals. The leading name-brand B8.5 kit we priced lists the same core parts at $864.99, about $215 more. PCV-only service kits run roughly $280 to $405 and leave the cooling parts behind.
| Vorsprung under supercharger kit | Leading name-brand kit | PCV-only service kit | |
|---|---|---|---|
| PCV valve | Hengst OE (AC, AH or AF) or Rein (AK), matched to your engine | OE PCV | OE or aftermarket PCV |
| Thermostat housing | Vorsprung billet housing with thermostat | Billet housing | Not included |
| Water pump | Graf metal impeller | Graf metal impeller | Not included |
| Heater pipe (Gen 1) | Aluminum | Aluminum | Not included |
| Intake gaskets and injector seals | Elring upper, lower and injector seals | Upper, lower and injector seals | Upper gaskets only |
| PCV vent tube | Genuine 06E103213 | Included | Included |
| Price (B8.5) | $649.99 | $864.99 | About $280 to $405 |
| Labor visits to the valley | One | One | Likely two |
Ready to do it once? Grab the B8.5 under supercharger kit with the 06E103547AH PCV valve, or find your platform in the under supercharger kits collection.
✅ Hengst, Graf and Elring OE-supplier parts ✅ VIN fitment check from real 3.0T owners ✅ Fast US shipping
Shop the B8.5 Under Supercharger Kit, $649.99
What's in the Vorsprung Under Supercharger Kit
- ✅ OE PCV valve matched to your engine (Hengst 06E103547AC, AH or AF, or Rein 06E103547AK)
- ✅ Vorsprung billet aluminum thermostat housing with thermostat
- ✅ Graf metal-impeller water pump
- ✅ Aluminum heater pipe (Gen 1 kits)
- ✅ Elring upper and lower intake manifold gaskets
- ✅ Genuine VW/Audi PCV-to-supercharger vent tube, 06E103213
- ✅ Elring injector seal kit
While the blower is off, most owners also replace the PCV pipe from the valve to the intake. Want an upgraded seal on the supercharger? Add the TruSeal intake manifold gasket set.
Which PCV Valve and Kit Fits Your Audi 3.0T
2010-2012 B8 S4, 2010-2012 S5 Cabriolet and 2009-2011 C6 A6 use PCV valve 06E103547AC. Get the B8 under supercharger kit ($574.99).
2013-2016 S4, 2013-2017 S5, 2013-2017 Q5 3.0T, 2014-2017 SQ5 and 2013-2014 A8 use 06E103547AH. Get the B8.5 under supercharger kit ($649.99).
C7 A6 built from May 2012 through 2015, 2013-2015 A7 and 2011-2015 4L Q7 use 06E103547AK. Get the C7 A6, A7 and 4L Q7 under supercharger kit ($639.99). 2012 A6 and A7 built before May 2012 use the AC valve and the 2012 C7 kit ($674.99).
Gen 2 CREC engines (2016-2018 A6 and A7, 2015-2018 A8, 2017-2019 Q7) use 06E103547AF. Get the Gen 2 CREC under supercharger kit ($649.99).
Not sure which engine or build date you have? Email help@vorsprungautowerk.com with your VIN and we'll confirm the right kit. Only need the valve? We also sell the Hengst 06E103547AC, 06E103547AH and 06E103547AF on their own.
Audi 3.0T PCV Valve Replacement: How the Job Goes
- ✅ Plan the time. Shops quote 3 to 5 hours for the PCV alone. A first DIY with the full kit is a full day or a weekend.
- ✅ Drain the coolant before you pull anything in the valley, and have fresh coolant of the correct spec ready.
- ✅ Remove the supercharger. Label every vacuum line and connector as it comes off. Photos save marriages.
- ✅ Swap the PCV valve and vent tube, then the thermostat housing, water pump and heater pipe while everything is open.
- ✅ Clean every sealing surface and install new gaskets and seals. Never reuse the old ones.
- ✅ Torque to spec, refill and bleed the cooling system, then clear codes and check for leaks and a steady idle.
Want the full breakdown of every part under the blower? Read our Audi 3.0T under supercharger kit guide.
Audi 3.0T PCV Valve Replacement FAQ
Do you have to remove the supercharger to replace the PCV valve on an Audi 3.0T?
Yes. On the EA837 3.0T the PCV valve sits at the back of the engine valley, under the supercharger. The supercharger has to come off to reach it, which is why the labor costs more than the part.
How much does an Audi 3.0T PCV valve replacement cost?
Shops commonly quote roughly $600 to $900 for the PCV valve alone, with 3 to 5 hours of labor. Most of that is supercharger removal and reinstall. Our under supercharger kits start at $574.99 and replace the PCV valve plus the other failure-prone parts in the valley, so you only pay for that labor once.
What are the symptoms of a bad PCV valve on the 3.0T?
A whistle or squeal at idle, a rough or hunting idle, lean or fuel trim codes, PCV regulator code P052E, oil consumption, and an oil cap that is hard to remove with the engine running. Our PCV valve diagnosis guide walks through the tests.
Which PCV valve does my Audi 3.0T need?
2010-2012 B8 S4, S5 Cabriolet and C6 A6 use 06E103547AC. 2013 and newer B8.5 S4, S5, Q5 3.0T and SQ5, plus the 2013-2014 A8, use 06E103547AH. C7 A6 built from May 2012, 2013-2015 A7 and 2011-2015 4L Q7 use 06E103547AK. Gen 2 CREC cars use 06E103547AF. Send us your VIN if you are not sure.
What else should I replace while the supercharger is off?
The thermostat housing, water pump, heater pipe, intake manifold gaskets, PCV-to-supercharger vent tube and injector seals all sit in the same area. Our under supercharger kits bundle them with the correct PCV valve for your car.
Can I replace just the PCV valve?
You can, and we sell the Hengst OE valves on their own. Just know that the supercharger has to come off either way, so replacing the cracked-plastic cooling parts at the same time usually saves you a second round of labor later.
How long does a 3.0T PCV valve replacement take?
Shops estimate 3 to 5 hours for the PCV valve alone. A first-time DIY with the full under supercharger kit is a full day or a weekend, since you are also replacing the thermostat, water pump and gaskets.
Is a PCV valve replacement a DIY job?
It is for a confident home mechanic with good hand tools, a torque wrench, fresh coolant and a way to bleed the cooling system. If you have never pulled the supercharger, read a model-specific procedure first and take your time with the coolant and vacuum connections.
Bottom Line on the Audi 3.0T PCV Valve Replacement
The PCV valve is the part that sends you looking, but the supercharger removal is the part that costs you. So make that labor count. A Vorsprung under supercharger kit gets you the correct OE PCV valve for your engine plus every other aging part in the valley, for less than the leading name-brand kit. Not on a B8.5? Find your platform in the under supercharger kits collection.
Find Your Under Supercharger Kit, from $574.99
Drive the difference. Drive Vorsprung.
Prices checked October 8, 2026 and subject to change. Labor figures are typical shop estimates and owner-reported quotes, and vary by shop and region.
