Technical Bulletin
Model(s)

Year

All

2008-2013

Eng. Code

Trans. Code

VIN Range From

VIN Range To

All

All

All

2.0L
(CCTA, CBFA)

Condition
10 12 01 September 18, 2012 2025501 Supersedes T. B. V101101 dated February 14, 2011 to include additional
model year and additional diagnostic assistance.
Crankcase Breather Diagnosis
Rough running, noise from engine, or MIL ON with DTCs P0300, P0301, P0302, P0303, P0304, P2279, P1297,
P1093, or P2187 stored in ECM.
DTC

Description

P0300

Random/Multiple Cylinder Misfire Detected

P0301

Cylinder 1 Misfire Detected

P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

P0304

Cylinder 4 Misfire Detected

P2279

Intake Air System Leak

P1297

Charger Throttle Connection, Drop in Pressure

P1093

Bank 1 Fuel Measuring System 2 Malfunction

P2187

System Too Lean at Idle, Bank 1

Tip:
A faulty PCV valve will allow pressurized intake air back into the valve cover/crankcase. This pressurized air can
blow out of several openings. The oil filler cap, air filter and dipstick should first be checked for evidence of oil
blow out.
• With the engine OFF, remove the engine cover and locate the hose connecting the intake manifold to the
crankcase. Disconnect the hose from the intake manifold side and clean off any residue with a cloth. Blow into
the hose and if there is some air resistance then the check valve is operating correctly. If there is no
resistance, then the PCV valve should be replaced.
• With the engine running, disconnect the hose from the valve cover. Plug the hose and check idle quality. If the
idle quality improves, replace the PCV valve.
• With the engine running, remove the dipstick. If the idle quality improves, replace the PCV valve.
• Remove the cap from the oil filler hole on the valve cover. Place a stiff piece of paper over the opening. The
paper should be sucked against the hole within a couple of seconds if the PCV is operating properly.
Page 1 of 3
© 2012 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice.
No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or
otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Bulletin
Using VAS tester
The best measurable way to ensure the functionality of the system is fuel trim readings in MVB32. If faults
pertaining to this part are found, do not erase the faults. Proceed with the steps as outlined within this bulletin,
prior to following the GFF test plan to avoid erasing fuel trim readings.
1. Using VAS tester read current fuel trim level in MVB 32 field 1 (idle fuel trim) and 2 (part throttle).
Nominal values are 0 ± 3 in both fields.
2. Replace original valve with a “test” part. A known good test part is to be kept by the service
center for further cases.
3. Make sure no additional loads such as A/C and heated seats are turned on during test.
4. If noise goes away or engine is no longer running rough, valve replacement is recommended.
5. Using VAS tester run basic settings 32 for at least 5 minutes.
6. While running basic settings 32 for 5 minutes we can monitor fields 1 and 2 for fuel trim readings.
7. If fuel trim values improve and move closer to 0, valve replacement is recommended.
8. If values do not improve, re-install original part. Use of the GFF is permitted at this point.

Technical Background
Incorrect diagnosis has caused excessive crankcase breather replacement.

Production Solution
Not applicable.

Service
Information only.

Warranty
Information only.

Page 2 of 3
© 2012 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice.
No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or
otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Technical Bulletin
Required Parts and Tools
No Special Parts required.

Tool Description

Tool No:

Midtronics Battery Tester/Charger

InCharge 940 (INC-940)

VAS Diagnostic Tool

VAS-PC, 5051B, 5052A, 6150X
(Base CD V19.01.00 and Brand DVD V19.17.00 or
higher)

Additional Information
All part and service references provided in this Technical Bulletin are subject to change and/or removal.
Always check with your Parts Dept. and Repair Manuals for the latest information.

Page 3 of 3
© 2012 Volkswagen Group of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Volkswagen Group of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice.
No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or
otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.