Technical Service Bulletin
23 MIL on, no start or rough running (DTCs P0087, P0088, P0191)
23 15 36 2040752/4 July 17, 2015. Supersedes Technical Service Bulletin Group 23 number 15-34 dated June 29,
2015 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A3

2010 - 2012

All

TDI clean diesel

Q7

2009 - 2012

All

TDI clean diesel

Condition
REVISION HISTORY
Revision

Date

Purpose

4

-

Revised Required Parts and Tools (Updated part numbers for Q7 fuel supply
module)

3

6/29/2015

Revised Service (Added note about shipping the fuel sample)

2

6/26/2015

Revised Service (Updated instructions for ordering fuel sample kit)

• MIL on.
• Vehicle either runs roughly or does not start.
• One or more of the following DTCs is stored in the engine control module (ECM), J623 (address word 01):
• DTC P0087 (Fuel rail/system pressure - too low)
• DTC P0088 (Fuel rail/system pressure - too high)
• DTC P0191 (Fuel rail pressure sensor “A” circuit range/performance)

Technical Background
Metallic particles in the high pressure fuel pump may cause the condition.

Production Solution
Not applicable.

© 2015 Audi of America, Inc.

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Audi 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 Service Bulletin
Service
Note:
Before proceeding, perform all GFF diagnostic procedures and check all components to determine a root cause of
the condition, including testing supply pressure to the high pressure fuel pump (low pressure side) and checking
for internal leakage from the injectors and N276 pressure regulating valve.
If no root cause can be found, use the following procedure to check for metallic particles in the high pressure fuel
pump.

Initial diagnosis of high pressure fuel pump:
1. Prepare to remove the N290 fuel metering valve by first
cleaning the area around the valve then drying the area
using compressed air (Figure 1). All debris must be
removed from the area to ensure that no debris enters the
fuel system and causes damage.
More information is available in the Elsa Repair Manual at
Engine>>Fuel Supply System>>General Repair
Information>>Clean Working Conditions.

Figure 1. Area surrounding N290 fuel metering
valve.
2. Remove the N290 fuel metering valve, and inspect both
the valve and valve bore for metallic particles (Figure 2).

Figure 2. N290 fuel metering valve and valve
bore shown with and without metallic particles.

© 2015 Audi of America, Inc.

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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
Audi 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 Service Bulletin
3. If metallic particles are found:
• This bulletin applies.
• The high pressure fuel pump and major components of
the fuel system will need to be replaced. Proceed to the
next section for instructions.
If metallic particles are not found:
• This bulletin does not apply.
• Reinstall the N290 fuel metering valve using light
pressure. Before reinstalling, ensure that the valve is
free of contaminates.
• Install and hand-tighten both M5 fasteners, ensuring
that the threads are clean and dry (pre-tighten to 2 Nm,
then to 6.5 - 7 Nm).

Figure 3. N290 fuel metering valve O-rings.

Note:
Before reinstalling the N290 fuel metering valve, check
the O-rings for damage (Figure 3). If any damage is
found, the high fuel pressure pump must be replaced
outside of this bulletin.
To prevent damage to the O-rings during reinstallation
of the valve, lubricate the O-rings with diesel fuel.

© 2015 Audi of America, Inc.

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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
Audi 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 Service Bulletin
Fuel sampling and analysis:
Before any repairs are performed, a fuel sample must be taken and analyzed.
1. Order the fuel sample kit (part number LQ1LKIT) from
the Compliance Label Ordering Portal under Service in
AccessAudi (Figure 4).
• A valid extension VIN must be used to order the kit.
• The fuel sample kit will be sent to the dealership
within one business day (note that dealerships in
Alaska and Hawaii will be contacted by Audi of
America with further instructions after the kit is
ordered).
The fuel sample kit contains a prepaid shipping
label, all necessary packaging, and instructions for
sending the sample to a designated test facility.
Note:
HAZMAT certification is required for packaging the
fuel sample, but NOT for shipping. The fuel sample
can be shipped to the laboratory through ground
shipment services, provided that the dealer is using
the Limited Quantity Kit (PN# LQ1LKIT).
• Test results will be provided to the dealership within
three days of receipt of the sample.
Figure 4. Compliance Label Ordering Portal.
2. Review the test results. The results will be marked
“PASS” or “FAIL” in the comments section of the
certificate of analysis (Figure 5 and Figure 6).

Figure 5. Example of a clean fuel sample analysis.

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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
Audi 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 Service Bulletin

Figure 6. Example of a contaminated fuel sample
analysis.
3. See Warranty Extension Bulletin AWA-15-05 for
details regarding high pressure fuel pump coverage
eligibility.
Tip: Remember to include the fuel sample kit
number in the repair order comments.

High pressure fuel pump replacement and fuel system repair:
Before proceeding, check ElsaPro for the latest information and detailed instructions for removal and replacement
of the components listed in this TSB.
1.

Use suction pump VAS5226 to clean the fuel delivery unit and fuel tank.

2.

Fill the fuel tank with five liters of fresh diesel fuel.

3.

Use suction pump VAS5226 to completely drain the fuel tank.

4.

Replace the in-tank fuel pump.

5.

Flush the fuel lines (both feed and return) from the fuel tank to the bulk head, using either mineral spirits or
brake cleaner with compressed air.
Alternate from both ends of the lines while using a screen to catch any debris that may still be in the line.
Verify that all metal is removed from both lines before proceeding.

6.

Following the instructions in the Elsa repair manual, replace the following components:
• High pressure fuel pump
• High pressure fuel lines
• Fuel rail (with both sensors included)
• All fuel injectors

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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
Audi 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 Service Bulletin
• Fuel return lines (overflow oil lines)
• Fuel filter
• Fuel filter housing
• Auxiliary fuel pump
7.

After replacements are complete, fuel the vehicle.

8.

Ensure that the fuel injector return line is properly seated and sealed.

9.

Using the VAS tester, perform the “Vent Fuel System” Guided Function. See the Elsa repair manual at
Engine>>Fuel Supply System>>20 Fuel Supply>>Fuel System, Bleeding for additional information.
Tip: If the test plan is unavailable through Guided Functions, switch to Self Diagnosis>>Engine
Electronics>>Basic Settings>>35, and perform the basic settings three times consecutively. For UDS
vehicles, perform basic settings for initial fueling.

10. Once the repairs are complete, test drive the vehicle.
11. Inspect for fuel seepage at the fuel injector return line connector. If seepage is found, the condition must be
corrected.

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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
Audi 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 Service Bulletin
Warranty
Claim Type:

Use applicable claim type. If vehicle is outside any warranty, this Technical Service Bulletin
is informational only.

Service Number:

2374

Damage Code:

0010

Labor Operations:

For Q7:
Fuel bleed

2003 0750

10 TU

Fuel tank cleaned

2010 2999

50 TU

Diesel fuel filter remove+reinstall

2034 1900

40 TU

Supply line cleaned

2038 2999

10 TU

Return line cleaned

2039 2999

10 TU

2 electric fuel pump remove+reinstall

2066 2000

190 TU

2 distribution rail remove+reinstall

2373 2047

130 TU

6 injector remove+reinstall

2340 2047

340 TU

High-pressure pump remove+reinstall

2374 1947

220 TU

Online fuel analysis

2374 0199

20 TU

Fuel bleed

2003 0750

10 TU

Fuel tank cleaned

2010 2999

50 TU

Diesel fuel filter remove+reinstall