23 MIL on, DTCs P0087, P0088, and/or P0191 stored in the ECM
23 19 53 2040752/9 November 19, 2019. Supersedes Technical Service Bulletin Group 23 number 19-52 dated
July 8, 2019 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

A3

2010 - 2012

All

TDI

Q7

2009 - 2012

All

TDI

Condition
REVISION HISTORY
Revision

Date

Purpose

9

-

Revised Warranty (Added Claim Type)

8

07/08/2019

Revised title
Revised Service (Removed fuel sample procedure)
Revised Warranty (Added Tip and Note)

7

04/18/2017

Revised Service (Updated fuel sample analysis procedure)
Revised Required Parts and Tools (Updated part numbers)

Customer states:
 MIL on.
 Vehicle either runs roughly or does not start.
Workshop findings:
One or more of the following DTCs is stored in the engine control module (ECM), J623 (address word 0001):
 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.

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© 2019 Audi 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 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.

Production Solution
Not applicable.

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 (a low-pressure side) and checking
for internal leakage from the injectors and N276 pressure regulating valve.
If there is no root cause 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. The area surrounding the N290 fuel
metering valve.

Page 2 of 9
© 2019 Audi 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 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.

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.
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 contaminants.
 Install and hand-tighten both M5 fasteners,
ensuring that the threads are clean and dry (pretighten 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.

Page 3 of 9
© 2019 Audi 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 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.

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.

Replace the suction jet pump.

6.

Following the instructions in the Elsa repair manual, replace the following components:
 High-pressure fuel pump (note that the supply and return line orientation for the HPFP may be reversed
on updated pumps installed on vehicles manufactured before 05/25/2010)
 High-pressure fuel lines
 Fuel rail (with both sensors included)
 All fuel injectors
 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.

Page 4 of 9
© 2019 Audi 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 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.

Warranty
Claim Type:

 110 – Verify Vehicle Warranty Coverage.
 G10 for CPO Covered Vehicles – Verify Owner.
 G14 - Verify Coverage in ElsaPro.
 If the 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

See SRT

Fuel tank cleaned

2010 2999

50 TU

Diesel fuel filter remove + reinstall

2034 1900

See SRT

Supply line cleaned

2038 2999

10 TU

Return line cleaned

2039 2999

10 TU

2 electric fuel pump remove + reinstall

2066 2000

See SRT

Suction jet pump remove + reinstall

2050 1901

See SRT

2 distribution rail remove + reinstall

2373 2047

See SRT

6 injector remove + reinstall

2340 2047

See SRT

High-pressure pump remove + reinstall

2374 1947

See SRT

Fuel bleed

2003 0750

See SRT

Fuel tank cleaned

2010 2999

50 TU

Diesel fuel filter remove + reinstall

2034 1951

See SRT

Supply line cleaned

2038 2999

10 TU

Return line cleaned

2039 2999

10 TU

Electric fuel pump remove + reinstall

2066 1900

See SRT

For A3:

Page 5 of 9
© 2019 Audi 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 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.

Diagnostic Time:

Electric fuel pump (aux) remove + reinstall

2066 1902

See SRT

Distribution rail remove + reinstall

2373 1912

See SRT

4 injector remove + reinstall

2340 2012

See SRT

Toothed belt remove + reinstall

1524 1912

See SRT

High-pressure pump remove + reinstall

2374 1962

See SRT

GFF

0150 0000

Time stated on the
diagnostic
protocol
(Q7: Max 80 TU)
(A3: Max 70 TU)

Claim Comment: