In this step-by-step Audi TT Mk1 DIY guide, I show how to replace the PCV valve pipe that connects to the Turbo Intake Pipe (TIP) on the Audi TT 1.8T.

This tutorial is aimed at beginners and covers the safest way to remove and replace ageing PCV hoses without causing damage to other parts of the breather system.

Over time, the original rubber PCV pipes become soft and brittle due to years of exposure to oil vapour. As these hoses deteriorate, they can collapse under boost pressure, leading to vacuum leaks, boost leaks, poor running, fault codes, and reduced performance.

One of the key tips in this video is removing the airbox to gain much better access to the PCV system. This helps reduce the risk of damaging surrounding hoses that may still be serviceable. When working on older Audi TT breather systems, disturbing perished hoses can easily create additional problems, so taking your time is essential.

In this video you'll learn:
• How the Audi TT Mk1 PCV system works
• Signs of failing PCV hoses
• Why old breather pipes collapse under boost
• How to safely remove the airbox for access
• How to replace the PCV valve hose to the Turbo Intake Pipe
• Tips to avoid damaging other ageing hoses
• Common mistakes beginners make during PCV repairs

If you're maintaining your Audi TT yourself and looking for straightforward DIY advice, this guide will help you complete the job confidently and avoid costly mistakes.

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