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VW Diagnostic Trouble Codes (DTC) P0410, P0411, and P1423
Eric Seifert, Automotive Technical Editor

I unlocked the shop door this morning to find an envelope in the early bird box. One of our regular customers had dropped off his 2000 VW ® Beetle ®. Chris had called me a week prior stating that the car was making a hissing noise and that the check engine light was on. I remembered a similar situation with a 1999 Jetta ® that we solved pretty easily. On the Jetta, the hissing and trouble code were caused by a cracked vacuum hose. After retrieving a P0411 from the Beetle’s computer, I started visually checking the vacuum lines. Sure enough, the vacuum hose from the brake booster to the secondary air inlet valve had broken in half.

The most common trouble codes or P Codes associated with broken or cracked vacuum hoses are: P0410 Secondary air injection (AIR) system malfunction, P0411 Secondary air injection (AIR) system incorrect flow detected or P1423 Secondary air injection (AIR) system throughput too small. This straightforward fix will require (1) VW P/N: 1JM 133 001 vacuum hose.

VW Engine IndentificationApplicable Vehicles
1998 - 2000 New Beetle ® with 2.0 L
Engine Code AEG
1999 - 2001 Golf® , Jetta with 2.0 L
Engine Code AEG

Vacuum hose material changed with introduction of engine codes AVH and AZG.

The engine number code letters and serial number can be found on the front of the engine near the engine / transmission joint (Engine code AEG shown). The engine/serial number may also be located on a label on the cylinder head cover and vehicle data plate.

Service Procedure
Review safety procedures in before beginning

1. Connect the VAS ® 5051 or 5052 (or equivalent) diagnostic tool.

2. Check for DTC P0410, P0411, or P1423 stored in DTC memory.

VW Vacuum Hose Diagram3. Remove upper engine cover.

4. Inspect for damaged vacuum hoses at secondary air inlet valve (2) to Combi valve (20) and vacuum hose (3) from secondary air inlet valve (2) to brake booster vacuum check valve.

5. If damaged, replace vacuum hoses from secondary air inlet valve (2) to Combi valve (20) and vacuum hose (3) from secondary air inlet valve (2) to brake booster vacuum check valve with hose from repair kit Part No: 1JM 133001.

• Repair kit VW P/N: 1JM 133 001 contains 1 vacuum hose approx. 3.3 ft long (cut and adjust to required length).

CAUTION! Part numbers are for reference only. Always check
with your Parts Supplier for the latest parts information.

6. Reinstall upper engine cover.

7. Erase any stored trouble codes with a VAS 5051 or 5052 (or equivalent) diagnostic tool.

Written by ALLDATA Technical Editor, Eric Seifert. Eric is an ASE certified Master Technician and Engine Machinist. He is also a graduate of the De Anza College Automotive Technology Program, with 20 years of independent shop and parts store experience.

©2009 ALLDATA LLC. All rights reserved. All technical information, images and specifications are from the ALLDATA Product. ALLDATA is a registered trademark of ALLDATA LLC. All other marks are the property of their respective holders.

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