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Crankcase Vent Valve
HENGST Crankcase Vent Valve - AS831M D853
Crankcase Vent Valve
HENGST Crankcase Vent Valve - AS831M D853

Hengst Crankcase Vent Valve As831 M D853

HENGST
Availability:
5+ in stock, ready to be shipped

Ships same or next business day

SKU AS831M D853
$65.20 - $65.20
$65.20
$65.20 - $65.20
$65.20
CALIFORNIA WARNING

Handling passenger or off-highway motor vehicle parts can expose you to chemicals such as phthalates and lead, which can cause cancer and reproductive harm. To minimize exposure, service the vehicle in a well-ventilated area, wear gloves, and wash your hands. For more information see www.P65Warnings.ca.gov/motor-vehicle-parts.

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HENGST

Crankcase Vent Valve

This product also goes by these part numbers: 06F 129 101 P, 06F129101P, AS831M D853, AS831MD853

This part also goes by the following cross reference.

Cross Reference Part Number: 06F129101P

Fits These Vehicles 20 applications
B7 A4
Make Model Engine Years
AUDI A4 B7 (8EC) 2.0 TFSI 2004–2008
AUDI A4 B7 (8EC) 2.0 TFSI quattro 2004–2008
AUDI A4 B7 (8EC) 2.0 TFSI 2006–2008
MK5 Golf
Make Model Engine Years
VW GOLF V (1K1) 2.0 GTI 2004–2009
VW GOLF V Variant (1K5) 2.0 TFSI 2007–2009
A4
Make Model Engine Years
AUDI A4 B7 Avant (8ED) 2.0 TFSI 2004–2008
AUDI A4 B7 Avant (8ED) 2.0 TFSI quattro 2004–2008
AUDI A4 B7 Avant (8ED) 2.0 TFSI 2006–2008
AUDI A4 B7 Convertible (8HE) 2.0 TFSI 16V 2006–2009
C6 A6
Make Model Engine Years
AUDI A6 C6 (4F2) 2.0 TFSI 2005–2011
AUDI A6 C6 Avant (4F5) 2.0 TFSI 2005–2011
B6 Passat
Make Model Engine Years
VW PASSAT B6 (3C2) 2.0 TFSI 2005–2010
VW PASSAT B6 Variant (3C5) 2.0 TFSI 2005–2010
8P A3
Make Model Engine Years
AUDI A3 (8P1) 2.0 TFSI 2004–2012
AUDI A3 (8P1) 2.0 TFSI quattro 2004–2012
AUDI A3 Sportback (8PA) 2.0 TFSI 2004–2013
AUDI A3 Sportback (8PA) 2.0 TFSI quattro 2004–2013
MK2 TT
Make Model Engine Years
AUDI TT (8J3) 2.0 TFSI 2006–2010
AUDI TT Roadster (8J9) 2.0 TFSI 2007–2010
MK5 Jetta
Make Model Engine Years
VW JETTA III (1K2) 2.0 TFSI 2005–2010

Fitment data last updated: 2026-03-19

Fits 20 vehicle applications Check vehicle fitment before ordering View fitment

About this Crankcase Ventilation (PCV)

The HENGST AS831M D853 is part of the crankcase ventilation (PCV) system, which routes gases that escape past the pistons back into the intake to be burned, and separates oil out of them. When the system fails, crankcase pressure and oil consumption can rise quickly.

Frequently asked questions

What does the crankcase ventilation system do?

It relieves pressure inside the engine by drawing blow-by gases back into the intake, while an oil separator or valve keeps oil out of the intake. Correct crankcase pressure protects seals and gaskets.

What are the signs of a failed PCV valve or oil separator?

A whistling or howling noise at idle, rough idle, lean-running fault codes, higher oil consumption, oil leaks from seals, blue smoke, or suction at the oil filler cap strong enough to hold the cap down.

What should I replace along with it?

Crankcase vent hoses become brittle with heat and age, so inspect and replace cracked hoses and fittings at the same time. On many European engines, the valve cover and separator are serviced together.

Can I replace PCV components myself?

Many parts are accessible with basic tools, though some separators sit under the intake manifold. Handle old plastic fittings carefully, as they can break during removal.

How do I make sure this crankcase ventilation part fits my car?

Compare the part numbers listed on this page with the number on your old part or in your vehicle's parts catalog, and check the fitment information. If you are unsure, contact us with your VIN before ordering.

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