NHTSA ID Number: 10133328
Manufacturer Communication Number: Circular-Emissio
TSB/Document Date: 2018-04-16
Summary
Over time and mileage and under certain conditions, the factory-installed catalysts may not perform as required by Federal regulations. If the effectiveness of a catalyst is reduced, this may result in an increase in tailpipe emissions and the vehicle could fail to pass an emissions inspection. ? Added repair availability for A8 (criteria 4E) and A6 (criteria 4F). ? Updated claiming instructions. ? Note added to repair instructions regarding consequential damage.
inspection.
What will we do?
To ensure that the vehicle continues to meet emissions regulatory requirements, your authorized
Audi
dealer will install improved catalysts. This work will take up to two days to complete and will
be performed for you free of charge. Please keep in mind that your dealer may need additional
time for the preparation of the repair, as well as to accommodate their daily workshop schedule.
What should you do?
In order to limit any possible inconvenience, please contact your authorized Audi
dealer as soon
as possible to schedule this service.
On or about December 29, 2017 the necessary repair instructions and parts will be available to
your authorized Audi
dealer.
Lease vehicles and
address changes
If you are the lessor and registered owner of the vehicle identified in this action, please forward
this letter immediately via first-class mail to the lessee within ten (10) days of receipt. If you have
changed your address or sold the vehicle, please fill out the enclosed prepaid Owner Reply card
and mail it to us so we can update our records.
Reimbursement of
Expenses
If you have previously paid for repairs relating to the condition described in this letter, the
enclosed form explains how to request reimbursement. We would be pleased to review your
reimbursement request.
Can we assist you
further?
If your authorized Audi
dealer fails or is unable to complete this work free of charge within a
reasonable time, please contact Audi
Customer Relations Monday through Friday from 8AM to
8PM EST at 1-800-822-2834 or via our “Contact Audi
Canada” page at www.audi.ca.
We apologize for any inconvenience this matter may cause; however we are taking this action to help ensure your vehicle
continues to meet and exceed your expectations.
Sincerely,
Audi
Customer Protection
The repair information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These
procedures are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To
determine whether this information applies, contact an authorized Audi
dealer. 2018 Audi
of America, Inc. and Audi
Canada. All Rights Reserved.
February 2018
26J2 Page 8 of 23
Customer Letter Example (CANADA) A6/A8 VEHICLES ONLY – February 2018 REPAIR DATE
This notice applies to your vehicle:
Subject: Emissions Recall 26J2 – Catalysts
Certain 2008-2011 Model Year Audi
Vehicles with 4.2L FSI Gasoline Engine
Dear Audi
Owner,
This notice is sent to you in accordance with the requirements of the Canadian Environmental Protection Act, 1999. Audi
has
determined that a defect, which relates to a prescribed emission standard, exists in certain 2008-2011 model year Audi
4.2L FSI
gasoline engine vehicles. Our records show that you are the owner of a vehicle affected by this action.
What is the issue?
Over time and mileage and under certain conditions, the factory-installed catalysts may not
perform as required by Federal regulations. If the effectiveness of a catalyst is reduced, this may
result in an increase in tailpipe emissions and the vehicle could fail to pass an emissions
inspection.
What will we do?
To ensure that the vehicle continues to meet emissions regulatory requirements, your authorized
Audi
dealer will install improved catalysts. This work will take up to two days to complete and will
be performed for you free of charge. Please keep in mind that your dealer may need additional
time for the preparation of the repair, as well as to accommodate their daily workshop schedule.
What should you do?
In order to limit any possible inconvenience, please contact your authorized Audi
dealer as soon
as possible to schedule this service.
In February 2018 the necessary repair instructions and parts will be available to your authorized
Audi
dealer.
Lease vehicles and
address changes
If you are the lessor and registered owner of the vehicle identified in this action, please forward
this letter immediately via first-class mail to the lessee within ten (10) days of receipt. If you have
changed your address or sold the vehicle, please fill out the enclosed prepaid Owner Reply card
and mail it to us so we can update our records.
Reimbursement of
Expenses
If you have previously paid for repairs relating to the condition described in this letter, the
enclosed form explains how to request reimbursement. We would be pleased to review your
reimbursement request.
Can we assist you
further?
If your authorized Audi
dealer fails or is unable to complete this work free of charge within a
reasonable time, please contact Audi
Customer Relations Monday through Friday from 8AM to
8PM EST at 1-800-822-2834 or via our “Contact Audi
Canada” page at www.audi.ca.
We apologize for any inconvenience this matter may cause; however we are taking this action to help ensure your vehicle
continues to meet and exceed your expectations.
Sincerely,
Audi
Customer Protection
The repair information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These
procedures are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To
determine whether this information applies, contact an authorized Audi
dealer. 2018 Audi
of America, Inc. and Audi
Canada. All Rights Reserved.
February 2018
26J2 Page 9 of 23
Campaign Work Procedure
26J2 Emission Recall
NOTE
•
Damages resulting from improper repair or failure to follow these work instructions are the dealer’s
responsibility and are not eligible for reimbursement under this action.
•
This procedure must be read in its entirety prior to performing the repair.
•
Due to variations in vehicle equipment and options, the steps/illustrations in this work procedure may not
identically match all affected vehicles.
•
Diagnosis and repair of pre-existing conditions in the vehicle are not covered under this action.
Vehicle Repair Availability
Criteria
Model
Repair Availability
8T
S5
RELEASED
4E
A8
RELEASED
4F
A6
RELEASED
Required Parts
Model/Criteria
S5 w/ Automatic
Transmission
(criteria 8T)
Quantity
Part Number
Part Description
1
8K0254252BX
Catalyst - Right
1
8K0254200LX
Catalyst - Left
2
8K0253115A
Gasket - Catalyst to manifold
2
8K0253115K
12
N 91130801
Nut - Catalysts
2
N 02300313
Nut - Bracket to Catalyst
2
1K0253141N
6
N 91151101
Subframe Crossbrace Bolts
2
N 10518405
2
N 90666003
O - Ring ATF Line
The repair information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These
procedures are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To
determine whether this information applies, contact an authorized Audi
dealer. 2018 Audi
of America, Inc. and Audi
Canada. All Rights Reserved.
February 2018
26J2 Page 10 of 23
Model/Criteria
S5 w/ Manual
Transmission after VIN
8T_8_023117
(criteria 8T)
Quantity
Part Number
Part Description
1
8K0254252BX
Catalyst - Right
1
8K0254200LX
Catalyst - Left
2
8K0253115A
Gasket - Catalyst to Manifold
2
8K0253115K
Gasket - Catalyst to Exhaust Pipe
12
N 91130801
Nut - Catalysts
2
N 02300313
Nut - Bracket to Catalyst
4
N 91129601
Bolt – Transmission to Engine
2
N 91129901
Bolt - Transmission to Engine
2
N 91153201
Bolt - Transmission to Engine
SEE ETKA
2
N 91150701
Bolt - Transmission to Engine
2
1K0253141N
6
N 91151101
Subframe Crossbrace Bolts
6
N 10719001
1
N 10518405
1
N 10139201
O-Ring - Right Coolant Pump to Flange
1
N 90912501
O-ring - Coolant Flange to Head
1
N 90761102
Nut - Gearshift Lever to Transmission
6
N 91143203
Bolt - Clutch Module to Drive Plate
12
N 90441103
Bolt - Axle Shaft to Transmission
The repair information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These
procedures are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To
determine whether this information applies, contact an authorized Audi
dealer. 2018 Audi
of America, Inc. and Audi
Canada. All Rights Reserved.
February 2018
26J2 Page 11 of 23
Model/Criteria
S5 w/ Manual
Transmission before
VIN 8T_8_023117
(criteria 8T)
Quantity
Part Number
Part Description
1
8K0254252BX
Catalyst - Right
1
8K0254200LX
Catalyst - Left
2
8K0253115A
Gasket - Catalyst to Manifold
2
8K0253115K
Gasket - Catalyst to Exhaust Pipe
12
N 91130801
Nut - Catalysts
2
N 02300313
Nut - Bracket to Catalyst
2
1K0253141N
6
N 91151101
Subframe Crossbrace Bolts
6
N 10719001
1
N 10518405
1
N 10139201
O-Ring - Right Coolant Pump to Flange
1
N 90912501
O-ring - Coolant Flange to Head
SEE ETKA
1
N 90761102
Nut - Gearshift Lever to Transmission
2
N 10255501
Power Steering Line Hose Clamp
8
WHT005657
Subframe Bolt
2
N 90986501
Fuel Line Clamps
2
N 90761102
1
4E0260749A
1
8E0260749C
2
N 10106402
Nut - Lower Control Arm
2
N 10241202
Bolt - Lower control arm
2
N 10699901
Bolt - Stabilizer Link
4
N 10425302
Bolt - Upper Guide Link
4
N 10286110
Nut - Upper Guide Link
The repair information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These
procedures are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To
determine whether this information applies, contact an authorized Audi
dealer. 2018 Audi
of America, Inc. and Audi
Canada. All Rights Reserved.
February 2018
26J2 Page 12 of 23
Model/Criteria
Quantity
Part Number
Part Description
1
079253019JX
Catalyst - Left
1
079253020JX
Catalyst - Right
1
079103484C
Right Cylinder Head Cover Gasket
1
079103650C
Gasket
2
079253039F
Gasket
2
1K0253141N
- 💯【Conta.ct us for Support Directly】If you met any...
- 🔥🔥🔥【2026 AUTEL FLAGSHIP MK900BT MK900-BT, NEW...
- 🚗【3000+ ACTIVE TESTS (50➡3000+), SAME AS MS...
- 🚗【40+ HOT SERVICES FOR 150 MAKES (28+➡40+)】Full...
- 🚗【OE ALL SYSTEM DIAGNOSE, AUTO SCAN 2.0: SCAN LICENSE...
- 【TURN OFF CEL】 This AL319 car scanner diagnostic tool...
- 【EXTENSIVE APPLICATION】 Autel AL319 Compatible with...
- 【FOR END USER & DIYERS】 This error code reader AL319 is...
- 【USER-FRIENDLY DESIGN】 This OBD2 scanner and check...
- 【HIGH-QUALITY SERVICES】 12 months war.ranty from the...
Last update on 2026-06-23 / Affiliate links / Images from Amazon Product Advertising API
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: Circular-Emissio
Replacement Service Bulletin Number:
MFR Communication Date: 2018-02-19
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA
Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU c0ding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations - 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA
AutoAuth: Now supports FCA
SGW module for Chrysler
, for Jeep
, for Dodge
(2018+), for Fiat
(2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Pr0gramming): Allows for Ford
, for Lincoln
, and for Mazda
ECU pr0gramming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order - 39+ Services/Resets/Adaptations/Relearns/Calibrations: XTOOL D7S full system car scanner diagnostic tool tackles 99% of common car issues through its 36+ special functions, including Oil Reset, EPB, SAS, BMS, Throttle Reset, Injector C0ding, ABS Bleed, TPMS Reset, Power Balance, etc and also covers specific-vehicle functions like Crank Sensor Relearn, ABS Initialization, Cylinder Power Balance, Fuel Trim Reset, Idle Relearn etc. This car diagnostic scanner enhances efficiency, making repairs and maintenance hassle-free. Tip: DO NOT for All vehicles, please check compatibility first
- Cost-effective ECU C0ding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW
, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford
, for Mazda
, and for Lincoln
. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase - OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
Last update on 2026-06-30 / Affiliate links / Images from Amazon Product Advertising API
- 【✅Compared to BOSSCOMM IF742, IF745 Offers Full-System Diagnostics】The BOSSCOMM IF745 car diagnostic scanner is an upgraded model of IF742. In addition to supporting all OBD2 Code Reader functions and 6 reset options (ABS/EPB/SAS/BMS/Oil/Throttle), it expands diagnostics from 4 systems (Check Engine/ABS/SRS/Transmission) to vehicle All systems, including Steering, Suspension, and Body Electronics. This provides deeper, more comprehensive diagnostic capabilities.
- 【✨10 OBD2 Functions】The BOSSCOMM IF745 scan tool’s DTC Lookup instantly translates fault codes into user-friendly explanations, its I/M Readiness feature streamlines emissions testing with a single tap, and Freeze Frame lets you pinpoint the exact moment of a fault for in-depth root-cause diagnosis. Combined with a live data dashboard and advanced diagnostics (O2S, OBMon, EVAP), it delivers comprehensive insights for confident troubleshooting.
- 【✨Deep Diagnostics for All Vehicle System Modules】Beyond code reading/clearing and ECU information retrieval, our all-in-one data stream feature lets you inspect all current fault codes and their locations across the vehicle’s systems. This vehicle code reader helps you turn off dashboard warning lights and perform a comprehensive self-check of your car at home—no more back-and-forth trips to the repair shop or hefty inspection fees.
- 【✨6 Essential Resets: ABS Bleeding, Oil, EPB, SAS, Throttle, BMS】The BOSSCOMM IF745 obd2 scanner diagnostic tool swiftly purges air from brake lines to restore braking sensitivity, fine-tunes maintenance cycles to eliminate false alerts, resolves parking brake issues with one-click control, recalibrates steering sensors for stability, optimizes engine idling/acceleration for smoother performance, and deeply resets battery systems to extend lifespan and range via precise parameter adjustments.❗NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨10,000+ Car Models, AutoVIN, 13 Languages】The BOSSCOMM IF745 vehicle scanner diagnostic tool covers 73+ global car brands and offers support in 13 languages, making it perfect for DIYers, auto mechanics, or as a thoughtful gift. With a single-click AutoVIN feature, it instantly retrieves vehicle serial numbers, streamlining diagnostics for users globally. This adaptable tool balances user-friendliness with precision, catering to both personal and professional requirements.✅Unsure about compatibility? Compatibility will vary on vehicles' model and year, pls reach us via 📧 [email protected] 📧 before purchase.
Last update on 2026-07-02 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.




