About this part
The 06H103495AK PCV valve is the crankcase breather oil separator fitted to the top of the Volkswagen Group EA888 Gen 1 and Gen 2 1.8 and 2.0 TSI / TFSI engines, the unit carried by the Golf GTI, Jetta, Passat, CC, Tiguan, Eos, Scirocco, Audi A3, A4, A5, A6, Q3, Q5, TT, Skoda Octavia, Superb, Yeti and the SEAT Leon and Altea. It is a genuine OEM-quality part, brand new and supplied with the integrated gasket, for owners chasing a rough or hunting idle, a whistling noise from the top of the engine, a slow oil loss or a lean fault code that keeps coming back.
PCV valve — crankcase breather oil separator for EA888 Gen 1 / Gen 2 1.8 and 2.0 TSI / TFSI engines, latest K revision with the integrated gasket; replaces 06H103495A through 06H103495AJ in the series.
OE/OEM Part Number:
06H103495, 06H103495A, 06H103495B, 06H103495C, 06H103495E, 06H103495J, 06H103495AE, 06H103495AH, 06H103495AJ, 06H103495AK
Hengst: 2219810406
What it does, and why the original fails
It keeps the crankcase under a slight vacuum. Blow-by gases that pass the piston rings collect in the crankcase, carrying oil vapour. The PCV valve is the metered door those gases pass through on the way back to the intake, where they are burned instead of vented to the atmosphere. Inside the black housing a rubber diaphragm and a pair of spring-loaded valves split the job: one path works under manifold vacuum at idle and low load, another opens when the turbo pressurises the intake, and a coarse mesh strips most of the oil out of the stream so it drains back to the sump. When it is healthy the engine holds roughly 20 to 60 millibar of vacuum in the crankcase at idle, and that vacuum is what keeps the crankshaft seals from weeping.
Failure mode: the diaphragm tears. The diaphragm lives in the round cover on top of the housing and flexes every time the manifold vacuum changes, millions of times a year, soaked in hot oil vapour. It hardens and cracks with age, and a cracked diaphragm is an unmetered air leak straight into the intake behind the mass air flow sensor. The result is the classic EA888 cluster of symptoms: a rough, hunting or fluctuating idle, a whistle or hiss from the top of the engine that changes with rpm, lean codes such as P0171 and P0507, occasional misfires, and a turbo car that struggles to hold boost. The valves can also gum open or shut with sludge, which drives crankcase pressure the other way and weeps oil from the valve cover, the dipstick tube and the rear main seal.
Why the whole assembly and not a repair kit. The diaphragm, the valves, the separator mesh and the check ball work as one calibrated unit, and the gasket between the housing and the valve cover takes a set over years. Fitting a complete new assembly with a fresh gasket in the latest K revision restores the calibrated behaviour in one job, which is why Volkswagen superseded through so many letters of this part number, each time refining the diaphragm material and the valve seating.
Symptoms, checks and installation
• Typical symptoms — rough or hunting idle, a whistling or hissing from the top of the engine, lean fault codes that return after clearing, a slow oil loss with no visible puddle, oil film around the valve cover or dipstick, blue smoke on overrun, and on turbocharged cars an underboost code alongside the lean codes.
• Confirm it before ordering — with the engine idling, remove the oil filler cap: a healthy system will try to suck the cap down and the idle will stumble; if the cap lifts off with no resistance and the idle does not change, the diaphragm has failed. Or hold a piece of card over the oil filler opening: strong suction pulls it onto the neck. A hand vacuum pump on the small port should hold vacuum; if it bleeds down instantly the diaphragm is split. Listen along the intake hose with a length of tubing to separate a PCV whistle from a split boost hose, which produces the same lean code.
• Installation notes — the assembly unbolts from the front of the valve cover after the small breather hose and, on some engines, the coolant hose clip are released. Take note of the hose routing before disturbing it. Clean the sealing face on the valve cover, fit the new unit with its gasket seated in the groove, and torque the fasteners evenly to the published figure — overtightening warps the plastic housing and creates the very leak you are there to fix. Refit the hoses so nothing rests on the exhaust side, start the engine, and check the crankcase vacuum at the dipstick with a slack gauge or the oil cap test again: it should now pull firmly. Clear the fault memory and road test.
• Fitment caution — this 06H103495AK fits EA888 Gen 1 and Gen 2 engines only. The Gen 3 engine from 2013 onward uses a different arrangement and a different part number, and the transverse and longitudinal installations carry different breather pipes even when the separator itself is shared. Confirm the part number printed on the old unit or the engine code on the vehicle data sticker, or send us a photo of the part you are removing.
Fitment
The 06H103495AK PCV valve is fitted to the EA888 Gen 1 and Gen 2 families of 1.8 and 2.0 litre TSI / TFSI petrol engines built between roughly 2008 and 2013, in both transverse and longitudinal installations. It supersedes the earlier letters in the same series and is itself the latest revision for these engines; it does not fit the Gen 3 EA888 from 2013 onward. Confirm the engine code on the vehicle data sticker or the part number on the old unit before ordering; the table below lists the usual applications.
| Make | Model | Years | Engine |
|---|---|---|---|
| VW | Golf V GTI / VI GTI, Jetta V / VI GLI, Eos, Scirocco III | 2008 – 2013 | 2.0 TSI / TFSI — AXZ, BWA, CCZA, CCZB, CTHA |
| VW | Passat B6 / B7, CC, Tiguan I | 2008 – 2014 | 1.8 / 2.0 TSI — BYT, CABB, CCZA, CCZB, CDAA |
| Audi | A3 8P, TT 8J, Q3 8U | 2008 – 2013 | 1.8 / 2.0 TFSI — CDAA, CDHA, BWA, CCZA |
| Audi | A4 B8, A5 8T, A6 C7, Q5 8R | 2008 – 2013 | 1.8 / 2.0 TFSI — CDHA, CDHB, CAEA, CAEB, CDN |
| Skoda | Octavia II RS, Superb II, Yeti | 2009 – 2014 | 1.8 / 2.0 TSI — CDAA, CDAB, CCZA, CCZB |
| SEAT | Leon II Cupra, Altea, Altea XL, Exeo | 2008 – 2014 | 1.8 / 2.0 TSI — CDAA, CCZA, CCZB |
Shipping and packing
Orders leave within one to two working days of cleared payment, each separator bagged with its gasket and boxed with foam so the housing and the spigots arrive unmarked. Tracking is emailed when the parcel is handed to the carrier. Customs charges, where they apply, are the buyer’s responsibility.
Condition & warranty
Brand new, twelve months warranty against manufacturing defects covering the assembly as supplied. The warranty does not cover damage from overtightened fasteners, from fitting to a Gen 3 engine, or from a sludged engine whose blocked breather paths overload the new unit. If a part arrives faulty, send us photos before returning anything.
Wholesale
Tiered pricing for 1 pc, 5 pcs and 20 pcs is shown below. Workshops and resellers servicing EA888 engines should ask for a combined quote — we price mixed orders of PCV valves, breather hoses, valve cover gaskets and ignition parts together.
