Rear Main Seal Failure on VW and Audi 2.0T TSI Engines

July 2, 2015

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The rear main seal is a circular seal mounted where the crankshaft comes out of the engine.  This seal would be mounted behind the flywheel or flex plate and prevents oil from leaking from the engine while still allowing the crankshaft to rotate.


The rear main seal on the TSI engine may sometimes fail.  This will often be caused by a failed PCV valve which causes crank case pressure issues.  When the Rear Main seal fails you will find an oil leak that is coming from the bottom of the vehicle where the engine and transmission meet.  Be sure the leak is not coming from higher up on the engine before deciding this is bad.  You also may experience fault codes like P0171 – System too lean, or misfire fault codes P0300, P0301, P0302, P0303 and/or P0304.  It is very important to note that these fault codes should only be considered as potentially related to a bad rear main seal if you are experiencing an oil leak from the area between the engine and transmission where the rear main seal is located.


2.0t TSI Rear Main Seal 

2.0t TSI Rear Main Seal Upgrade Kit

Genuine VW/Audi Rear Main Seal

z rear main-


The Rear Main Seal is between the engines crankshaft and the flywheel, which means the transmission, must be removed to replace this part.  It is important to note that if you have an issue with your rear main seal leaking on your VW or Audi 2.0T TSI engine you should definitely replace your PCV Valve.  Failing to do so may result in premature failure of your new rear main seal.


Parts Discussed Above

OEM VW/ Audi 2.0T TSI Rear Main Seal

OEM VW/ Audi 2.0T TSI PCV Valve


Why the 2.0T TSI rear main seal leaks?

Paul Barrett


CEO | Ex Dealer Technician | VW Audi Parts Savant | Father | Husband | Chipotle Enthusiast
Creating a VW and Audi Parts Company that Cares


on Rear Main Seal Failure on VW and Audi 2.0T TSI Engines.
  1. Thomas

    Good to have an explanation for what I’m paying dealer for here in Quebec. Thanks!

  2. josh

    Hey whats going on Paul as a question of curiosity I just replaced all four injectors, and intake runner control(manifold) now another lean code comes up and they are trying to tell me its the rear main seal, question being is it possible just the pcv valve is bad?

    • Paul Barrett

      Yes its possible its the PCV valve. You should consider replacing that first, as even if it doesn’t fix your lean code you will want a new PCV on the vehicle when installing a new rear main.

  3. Dutch

    Also what makes the clutches on the MKV TSI’s so expensive? I figured I would do the clutch since I’ll be that far into it and it probably got oil on it, but even OE style clutches are $750! Performance are $1200, What’s up with that?!? Makes me want to go back to hondas

    • Paul Barrett

      These prices are pretty standard for VW and Audi models. Generally VW and Audi performance and repair parts would be be more than those found on a Honda.

  4. Patrick

    Great explanation. I just picked up my 09 Jetta from the dealer after misfire 1 & 2 P0300, P0301, P0302. They cleaned the intake valves and replaced a fuel tank vent valve to the tune of $1016. He also told me the real main seal was noticed to be leaking and quoted $1575 to replace the seal and the crankcase vent valve. So my question is, will just replacing the valve prolong the life of the seal a little longer. He made it sound like it could fail at anytime and I would get the same codes, and running rough again, along with a bigger oil leak. I haven’t noticed any oil in my garage or driveway either.

    Any advice?

    • Paul Barrett

      Tough to say for sure. If you already have a leak it will likely only get worse over time.

  5. Kevin Combs

    We have a 2010 Audi A4 2.0 turbo that the Audi dealer says needs a malfunctioning PCV valve replaced and a rear seal. The vehicle only has 43k miles and has been properly maintained. I also recently received a class action notice to bring in the car for evaluation of issues with low oil pressure and heavy oil consumption, which has definitely been an issue with this vehicle. Are these items related?

    • Paul Barrett

      You could speculate they are related but not really. The issues with Audi oil consumption were related to issues with the piston.

    • Mike

      My daughter had exactly the same problem this month, had both the PCV valve and the main seal replaced, and experienced exactly the same failure again one week later. Did the problem disappear permanently for you after the replacements, or did it return?

  6. Mike

    I just bought a 2016 JETTA 1.8T a few weeks ago. How worried should I be about my car failing? Or is this issue resolved on the newer models already? Thanks!

  7. Antonio Ingram

    Are there any temporary solutions to repair the rear main seal? I just bought a 2011 VW CC Sport “as is” and later finding out that there is a rear oil main seal leak. PLEASE HELP!

      • Matt

        Hello Paul. I just brought my 2010 A4 w/ 132k miles into my local Audi dealer for this issue. They diagnosed the issue as a faulty rear main seal; however, given the number of miles on the car they said it couldn’t/shouldn’t be replaced. Based on the discussion it sounds like it can along with the PVC valve. Does that make sense? I’m taking my car into another dealer next week to get a 2nd opinion but would love to get yours as well.


        • Paul Barrett

          You should replace the PCV along with the rear main.

  8. Steve

    I’m in the market for an Audi 2010 2lt t . All the cars that Iv looked at, have oil under motor. This is now making me think twice .

  9. Brandon

    In the article, you mention “Be sure the leak is not coming from higher up on the engine before deciding this is bad.” What does it mean if the leak is in the rear but higher up? I think that is my problem on an 07 A4 convertible. Thanks.

      • Brandon

        Thanks for the reply. Looks like a wealth of knowledge in your videos. Any timeline for when my question will be addressed? My garage floor will be grateful.

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