Checking exhaust gas recirculation cooler changeover valve N345 and vacuum hoses — AUDI
Checking exhaust gas recirculation cooler changeover valve N345 and vacuum hoses on Audi: 14 steps, engines CAYD, CAYE, CFHC, CFHE.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: platform code 2C0
- Special tools named: VAS 6213
- Renewed: vacuum hose
Don't miss
- Do not use screws or threaded bolts.
📋 Procedure
- Pull off vacuum hose (arrow) from connection.
- Connect hand vacuum pumpVAS 6213 to removed vacuum hose (arrow) and generate a partial vacuum of 0.6 bar.
- Observe pressure gauge of hand vacuum pumpVAS 6213 for approx. 30 seconds.
- Unhook exhaust gas recirculation cooler changeover valve N345 from bracket on intake pipe.
- Pull off vacuum hose (arrow) on bottom connection of exhaust gas recirculation cooler changeover valve N345.
- Seal open end of hose with suitable plug from engine bung setVAS 6122. [Note: Do not use screws or threaded bolts.]
- Connect hand vacuum pumpVAS 6213 to pulled-off vacuum reservoir and generate a partial vacuum of 0.6 bar.
- Observe pressure gauge of hand vacuum pumpVAS 6213 for approx. 30 seconds.
- Renew vacuum hose.
- Connect hand vacuum pumpVAS 6213 with vacuum hose from VAS 6213 to exhaust gas recirculation cooler changeover valve N345 and generate a partial vacuum of 0.6 bar.
- Observe pressure gauge of hand vacuum pumpVAS 6213 for approx. 30 seconds.
- Renew exhaust gas recirculation cooler changeover valve N345.
- First pull vacuum hose off at hand vacuum pumpVAS 6213.
- Reconnect vacuum hose on T-piece and on exhaust gas recirculation cooler changeover valve N345.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.