NHTSA ID Number: 10173986
Manufacturer Communication Number: L-TT-0254-18
TSB/Document Date: 2020-04-20
Summary
TT: In certain cases of leaking air conditioning systems, the root cause of the leak is inadvertently overlooked, causing a repeat repair. To improve customer satisfaction and repair A/C system leaks in one dealer visit, Toyota
has developed a set of guidelines for evaluating A/C system components.
Tech Tip L-TT-0254-18
March 26, 2020
Subject
Market
Air Conditioning System – Improved Component
Inspection
USA
Service Category
Section
Vehicle Interior
Heating/Air Conditioning
Applicability
Lexus
APPLICABLE VEHICLES
2015
2015-2021
2015-2021
2018-2020
2015
2015-2016
2015-2018
2015-2021
2016-2017
2015-2021
2015-2021
2019-2021
2015
2016-2021
2015-2021
2018-2021
2015-2021
IS250
IS350
RX450H
GS300
IS250C
LS600H
CT200H
LX570
GS200T
RC350
RC F
UX200
IS350C
IS300
GX460
LS500H
NX300H
2019-2021
2018-2021
2018-2021
2015-2021
2016-2020
2015-2021
2015-2018
2015-2017
2021
2018-2021
2015-2017
2016-2017
2018-2021
2015-2020
2015-2021
2016-2017
2016-2021
UX250H
LS500
NX300
ES300H
GS F
ES350
GS450H
LS460
LC500C
LC500H
NX200T
RC200T
LC500
GS350
RX350
IS200T
RC300
CONDITION
In certain cases of leaking air conditioning systems, the root cause of the leak is inadvertently
overlooked, causing a repeat repair. To improve customer satisfaction and repair A/C system leaks in
one dealer visit, Toyota has developed a set of guidelines for evaluating A/C system components.
Expires on
Ver. 2.9 01/01/2018 L
03/26/2021
Rev1
© 2018, Lexus, a Division of Toyota Motor Sales, USA
Page 1 of 7
Tech Tip L-TT-0254-18
March 26, 2020
Subject
Market
Air Conditioning System – Improved Component
Inspection
USA
Applicability
Lexus
RECOMMENDATIONS
2) Inspect for O-ring Abnormality
• Remove the O-ring from pipe/component for
inspection.
• Using a plastic pick tool to remove O-ring
and prevent damage to mating part.
Use a non-metallic
tool for
O-ring removal.
Using a metallic
tool could result in
damage to other
components
OK Part* - Line at middle of O-ring is straight with
no deformation. No tears, or crushed areas.
*O-rings should be replaced anytime they are
removed from a pipe/component to prevent leaks
and foreign material.
Twisted O-Ring – No Good Part
Line at middle of O-ring is not straight.
Cut/Dent/Crush – No Good Part
O-ring damaged by another component.
Replace O-ring, proceed with A/C Pipe
Inspection.
Foreign Material– No Good Part
O-ring contaminated by material outside A/C
system.
Replace O-ring, proceed with A/C Pipe
inspection.
Step 2:
Inspect
O-Ring
Complete
Expires on
Ver. 2.9 01/01/2018 L
03/26/2021
Step 3:
Inspect
A/C Pipe
(Cont. to pg. 3)
Rev1
© 2018, Lexus, a Division of Toyota Motor Sales, USA
Page 2 of 7
Tech Tip L-TT-0254-18
March 26, 2020
Subject
Market
Air Conditioning System – Improved Component
Inspection
USA
Applicability
Lexus
3) - Inspect for A/C Pipe Abnormality
OK Part - Light scratching parallel with O-ring
groove. This is caused by normal part
processing. Pipe is ok to reuse.
Damage – No Good Part
Pipe is damaged due to deep
scratching or gouge of base
metal. Pipe replacement is
recommended to prevent repeat
repair.
Foreign Material – OK Part
Pipe has foreign material stuck
to it. Material can be cleaned off
using a non-metallic tool and the
pipe is ok to be reused.
Corrosion – No Good Part
Pipe is damaged due to
corrosion of base material. Pipe
replacement is recommended to
prevent repeat repair.
Step 4:
Inspect Mating
Components
(Cont. to pg. 4,5,6)
Step 3:
Inspect
A/C Pipe
Complete
Expires on
Ver. 2.9 01/01/2018 L
03/26/2021
Rev1
•
•
•
4a - Compressor Inspection – Pg.4
4b - Expansion Valve – Pg. 5
4c - Condenser Inspection – Pg.6
© 2018, Lexus, a Division of Toyota Motor Sales, USA
Page 3 of 7
Tech Tip L-TT-0254-18
March 26, 2020
Subject
Market
Air Conditioning System – Improved Component
Inspection
USA
Applicability
Lexus
4a) - Inspect for A/C Compressor Abnormality
OK Part - Light scratching parallel with O-ring groove.
This is caused by normal part processing. Compressor is
ok to reuse.
Damage – No Good Part
Compressor seal bore is damaged
due to deep scratching
perpendicular to O-ring groove.
Compressor replacement is
recommended to prevent repeat
repair.
Foreign Material – OK Part
Compressor has foreign material
stuck to seal bore.
Material can be carefully cleaned
off using a non-metallic tool and
the compressor is ok to be reused.
Expires on
Ver. 2.9 01/01/2018 L
03/26/2021
Rev1
© 2018, Lexus, a Division of Toyota Motor Sales, USA
Page 4 of 7
Tech Tip L-TT-0254-18
March 26, 2020
Subject
Market
Air Conditioning System – Improved Component
Inspection
USA
Applicability
Lexus
4b) - Inspect for Expansion Valve Abnormality
OK Part - Light scratching parallel with O-ring
groove. This is caused by normal part processing.
Expansion valve is ok to reuse.
Damage – No Good Part
Expansion valve seal bore is
damaged due to deep scratching
perpendicular to O-ring groove.
Expansion valve replacement is
recommended to prevent repeat
repair.
Foreign Material – OK Part
Expansion Valve has foreign
material stuck to seal bore.
Material can be carefully cleaned
off using a non-metallic tool and
the expansion valve is ok to be
reused.
Expires on
Ver. 2.9 01/01/2018 L
03/26/2021
Rev1
© 2018, Lexus, a Division of Toyota Motor Sales, USA
Page 5 of 7
Tech Tip L-TT-0254-18
March 26, 2020
Subject
Market
Air Conditioning System – Improved Component
Inspection
USA
Applicability
Lexus
4c) - Inspect for Condenser Abnormality
OK Part - Light scratching parallel with O-ring groove. This is
caused by normal part processing. Condenser is ok to reuse.
Damage – No Good Part
Condenser seal bore is damaged
due to deep scratching perpendicular
to O-ring groove.
Condenser replacement is
recommended to prevent repeat
repair.
Foreign Material – OK Part
Condenser has foreign material
stuck to seal bore.
Material can be carefully cleaned
off using a non-metallic tool and the
condenser is ok to be reused.
Corrosion – No Good Part
Seal bore is damaged due to
corrosion of base material.
Condenser replacement is
recommended to prevent repeat
repair.
Expires on
Ver. 2.9 01/01/2018 L
03/26/2021
Rev1
© 2018, Lexus, a Division of Toyota Motor Sales, USA
Page 6 of 7
Tech Tip L-TT-0254-18
March 26, 2020
Subject
Market
Air Conditioning System – Improved Component
Inspection
USA
Applicability
Lexus
LINK REFERENCES
This Tech Tip does not contain any link references
Expires on
Ver. 2.9 01/01/2018 L
03/26/2021
Rev1
© 2018, Lexus, a Division of Toyota Motor Sales, USA
Page 7 of 7
- R134a Replacement - Hydrocarbon blend that is 100% natural...
- 6oz (11.7 fl oz) Cans - Compressed gas is measured by...
- SSV Cans - Self Sealing Valve allows for the storage of...
- Disclosures - Product is flammable like many other modern...
- ENGINEERED R134a REPLACEMENT - HIGH-EFFICIENCY FORMULATION...
- PREMIUM HIGH-PURITY SPECIFICATION (99.5%+) - Manufactured to...
- SIGNIFICANTLY LOWER CHARGE WEIGHT REQUIRED- Hydrocarbon...
- DESIGNED FOR CONSISTENT, EFFICIENT COOLING PERFORMANCE...
- PROFESSIONAL-STYLE SELF-SEALING VALVE- 6 oz net cans feature...
Last update on 2026-05-22 / 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: L-TT-0254-18
Replacement Service Bulletin Number:
MFR Communication Date: 2020-03-26
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:APPLIANCE:AIR CONDITIONER
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- 💯【Conta.ct us for Support Directly】If you met any issues about: Received a registered device/ Language Changing/ Function not Support/ VCI150 Blueto-oth connector malfunction/ Subscription Renewal, please conta.ct us via 📞autelsupply @outlook. com🛣️, we will provide perfect solution for you. ⚠️Note: Autel MK900BT comes with 1-Year Free Software Update, most features will remain active after update subscription expires. 1. For questions regarding updates or need more useful accessories, please conta.ct us via 📞autelsupply @outlook.com🛣️. 2. If the device fails to charge or turn on, please conta.ct us via 📞autelsupply @outlook. com🛣️, we will handle it promptly.
- 🔥🔥🔥【2026 AUTEL FLAGSHIP MK900BT MK900-BT, NEW MODEL OF MK808S MK900 MX900 MK808BT MX808S】2026 newest Autel MK900BT retains all features of MK808S MX900 MX808S MK808Z MK808Z-BT MK808K-BT, while EXTRA added powerful functions (value 2000+ bucks). The Pro-level Autel MK900BT makes a big leaps: 28+➡40+, 50+➡3000+ Active Tests, 2026 NEW✅CAN FD & DOIP protocols ✅Pre&Post diagnostic report ✅WIFI Print ✅Auto VIN&Auto Scan 2.0 ✅Scan VIN/ License ✅Battery Test (Need purcha.se BT506). If found defect or us.ed, please conta-ct 📞autelsupply @outlook. com📞 get perf-ect solut.ion.
- 🚗【3000+ ACTIVE TESTS (50➡3000+), SAME AS MS906 PRO】Differ from MS906BT MS906 MP808 MK808 MX808 MK808BT only 50 tests, Autel scanner MK900BT escaner automotriz professional offers 3000+ active tests, it can send command to ECUs & monitor actuators operation, quickly locating faulty components. Bidirectional scanning takes your diagnostics to the next level with menu lists 3000+ active tests, such as windows, rear mirrors, sunroof, wipers, fuel injector, coolant fans, radiator fan, AC clutch, coolant pump and more. Note: Functions are not available for all vehicles, please send vehicle VIN to us check compatibility.
- 🚗【40+ HOT SERVICES FOR 150 MAKES (28+➡40+)】Full level-up of OBD2 code reader MaxiCOM MK808S MK808 MK808Z MX808 MK808Z-BT with 28 service, Autel scan tool MK900BT/ MK900-BT offers 40+ maintenance service on 150+ brands 10,000 vehicles from 1996-2025-2026. Hottest Services like: Oil Reset, ABS Bleed, SAS Calibration, Injector Coding, SRS, Throttle Reset, Gearbox Reset, Battery Registration etc. Added 12+ advanced resets: rain slash light sensor reset, HVA.C/ SUS calibration etc. Welcome to send Vehicle Make>Model>Year>VIN>Functions you required to 📞autelsupply @ outlook . com📞 check compatibility.
- 🚗【OE ALL SYSTEM DIAGNOSE, AUTO SCAN 2.0: SCAN LICENSE/ AUTO VIN】2026 new release Autel MaxiCOM MK900-BT scan tool embodies all system diagnostic with its 8in display for all vehicles. Like Sna.p-on tools, it can perform ✔Read/Clear Codes✔Displays 5-in-1 Live Data✔Record & Playback Data✔Retrieve Info on all available systems like ABS ECM BCM SRS TCM etc. In addition to Auto VIN technology, Autel MK900BT adds Scan License/ Auto Scan 2.0 to identify vehicle’s VIN/ license, make, year, model, no need manual input; One-click WiFi Printing of Pre&Post comparison diagnostic reports, highlight root causes of problems.
- 【TURN OFF CEL】 This AL319 car scanner diagnostic tool supports Reading and Clearing DTCs, DTC Look Up, displaying Live Data, Freeze Frame & I/M Readiness, view vehicle information, etc., to figure out the root cause of the Check Engine Light (CEL) and turn it off, helping you catch any potential issues early and avoid excessive costs from unnecessary repairs.
- 【EXTENSIVE APPLICATION】 Autel AL319 Compatible with 7 languages (English, French, Spanish, etc.) and various post-1996 OBD II protocol vehicles (Toyota
, Nissan, Honda, Ford, etc.), this OBD II scanner provides accurate and fast diagnosis for worldwide car owners. - 【FOR END USER & DIYERS】 This error code reader AL319 is “plug and play” and comes with an easy interface. Even if you’re not familiar with vehicle repair, you can quickly take control of this obd2 scanner, and get the information you want.
- 【USER-FRIENDLY DESIGN】 This OBD2 scanner and check engine code reader features a patented One-Click I/M Readiness, TFT color display, built-in speaker, LED Indicator etc. The cable is long enough without being too long and getting in the way. No batteries are needed.
- 【HIGH-QUALITY SERVICES】 12 months war.ranty from the date of purchase and lifetime free update are offered by this Automobile OBDII scan tool. Welcome to contact us via Q&A, email, or hotline, and our after-sale-service team for technical support.
- 📞【Warm Tips】Dear friend, if you have any issues or need any tech support after receiving your MK900BT (received a registered item/ language changing/ functions compatibility/ renew subscription, etc.), please don't hesitate to tell us directly via 💌Autelonline @ outlook . com💌, we will do whatever we can to help you at first time. Besides, if you need other accessories, such as Autel endoscope MV108S, please don't hesitate to con-tact us.
- 🔥【Amazon Choice MK900BT, 2.0 Newer of MK900 MX900 MS906 MK808BT PRO MP808S MK808S MX808S】Big News! 2026 Autel most cost-effective 8in All System & Bidirectional Scan Tool MK900BT is born! 619 only, yet featuring 40+ Hot Services same as MaxiSys Ultra/ MS909/ Elite II Pro/ MK908P/ MS906 PRO/ MS906MAX, among lots of advanced & newer functions: ✅3000+ Active Tests ✅CAN FD/ DoIP new protocols ✅OE All System Diagnosis, Autel Scan 2.0 ✅5-in-1 Live Data ✅detailed Pre & Post Scan ✅Scan VIN/License ✅WiFi Print ✅FAC AutoAuth & Renault SGW ✅Endoscope with MV108/MV105 ✅160+ car brands coverage, etc.
- 😊【Why Choose Autel Scanner MK900-BT, Not MK808S MK900 MX900?】➊ MK900BT escaner automotriz designs with Autel MaxiVCI V150, adopting advanced German Wireless Technology with more stable&faster data transmission, allowing you to work in and around vehicles with a 10M/33FT remote diagnostics. Instead, at almost the same budget, MK900 MK808S outdated wired code reader only with 1m cable, so you must curl up on the steering wheel! ➋ MK900BT can work with Autel BT506 to perform professional cranking charging system tests and in-vehicle & out-of-vehicle battery tests, but MK900 MK808S CANNOT. Some sellers say MK900 can work with BT506, pls don't believe it, who are not Autel a.uthorized sellers.
- 🚀【Upgraded Hardware 2.0, 10X F.aster than Ever】Based on old Android 4.4.4 ver. of MX808 MK808 MK808BT MP808 MP808BT MS906 MS906BT, Autel scan tool MK900-BT takes a big leap to 🟢f.astest OS 11 🟢4-core, 1.8GHz RK3566 speed boosted + lower power consumption🔋doubled 7700mAh Battery 🟢larger & sharper 8" 1280*800 touchscreen with intuitive user interface 🟢expanded 4+64G enough to save more files/data 🟢8M Rear camera gives clearer snapshot, etc. MK900BT scanner for car, is the best bang for your b.uck in the category.
- 📢【New Released: CAN FD/DoIP + WIFI Print + Pre & Post Scan + Scan VIN/ License】MK900BT OBD2 scanner diagnostic tool updates lots of advanced features previously available only for scanners above 2000$ (MS906 Pro MS908S Pro, etc.) ✅New protocols CAN FD works for GM 2019+ ✅DOIP works for Volv.o 2018+, Jaguar&Land Rover 2017+, BM.W F&G chassis models ✅Same WIFI Print as MaxiSys Ultra ✅Detailed Pre/ Post scan reports to up repair efficiency ✅Scan VIN/License can identify your cars in seconds, more accurately! But Autel MK808S/ MK808BT PRO cannot.
Last update on 2026-06-12 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.