How to Replace the PCV Valve in a VW Jetta

by Editorial Team

When working properly, the positive crankcase ventilation (PCV) valve controls the amount of pressure that builds up in your engine. The first sign that your PCV valve needs replacing is that your engine will start to run rough while you're idling. You can make this repair yourself for your Volkswagen Jetta.

Step 1

Find the PCV valve on the rocker arm cover of your Volkswagen Jetta. You'll find it at the end of the cover with a hose attached to it.

Step 2

Remove the PCV valve from the cover in order to test whether it needs replacement. Remove it by pulling it away from the grommet.

Step 3

Test the PCV valve before you remove the hose. To do this, leave the engine of your Jetta idling. Feel the end of the valve to check for the manifold vacuum. Also, shake the valve and listen for a rattling sound. If the PCV valve doesn't have a vacuum or makes a rattling sound, you'll need to make the replacement.

Step 4

Slide the new PCV valve into the grommet of the former PCV valve. Once you have firmly pushed it into place, you can reattach the hose to finish the installation.

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