NHTSA ID Number: 10164911
Manufacturer Communication Number: L-SB-0003-18_Rev
TSB/Document Date: 2019-09-16
Summary
TSB: REVISION NOTICE August 19, 2019 Rev2: * Applicability has been updated to include 2019 model year RX350 vehicles. Any previous printed versions of this bulletin should be discarded. REVISION NOTICE March 12, 2018 Rev1: * The Parts Information section has been updated. Any previous printed versions of this bulletin should be discarded. Some 2016 - 2019 model year RX 350 vehicles may exhibit a droning noise from the exhaust system at takeoff or under light acceleration. Countermeasure parts are available to reduce the droning noise. Follow the Repair Procedure in this bulletin to address this condition.
L-SB-0003-18
Rev2
January 25, 2018
Exhaust Drone at Takeoff or Under Light Acceleration
Service
Category
Section
Intake/Exhaust
Market USA
Applicability
YEAR(S)
MODEL(S)
2016 - 2019
RX350
ADDITIONAL INFORMATION
REVISION NOTICE
August 19, 2019 Rev2:
Applicability has been updated to include 2019 model year RX350 vehicles.
Any previous printed versions of this bulletin should be discarded.
REVISION NOTICE
March 12, 2018 Rev1:
The Parts Information section has been updated.
Any previous printed versions of this bulletin should be discarded.
Introduction
Some 2016 – 2019 model year RX 350 vehicles may exhibit a droning noise from the exhaust
system at takeoff or under light acceleration. Countermeasure parts are available to reduce the
droning noise. Follow the Repair Procedure in this bulletin to address this condition.
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EG1708
R & R Exhaust Center Pipe Assembly
0.5
17420-0P250
17420-31571
91
99
APPLICABLE WARRANTY
This repair is covered under the Lexus Federal Long-Term Emission Warranty. This warranty
is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s
in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
© 2019 Lexus
, a division of Toyota Motor Sales, USA
Page 1 of 5
L-SB-0003-18
Rev2
January 25, 2018
Page 2 of 5
Exhaust Drone at Takeoff or Under Light Acceleration
Parts Information
PART NUMBER
PART NAME
QTY
Pipe Assy, Exhaust, Center
1
17451-0D140
Gasket, Exhaust Pipe
1
90917-A6001
Gasket, Exhaust Pipe, No. 2.
1
PREVIOUS
NEW
17420-0P250
17420-31570
17420-0P540
Required Tools & Equipment
REQUIRED TOOLS & MATERIAL
QUANTITY
1
Repair Procedure
1. Confirm the condition exists.
Does the vehicle exhibit a droning noise from the exhaust system?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2019 Lexus, a division of Toyota Motor Sales, USA
L-SB-0003-18
Rev2
January 25, 2018
Page 3 of 5
Exhaust Drone at Takeoff or Under Light Acceleration
Repair Procedure (continued)
2. Confirm if the vehicle has the NEW center
exhaust pipe. The NEW part can be
identified by the addition of a bracket and
damper attached to the center exhaust pipe
as shown.
Figure 1.
1
2
Does the vehicle have the NEW center
exhaust pipe?
YES — This bulletin does NOT apply.
Continue diagnosis using the
applicable Repair Manual.
NO — Continue to step 3.
3
3. Remove the center exhaust pipe assembly.
1
Old Part
2
New Part
3
Bracket and Damper
Figure 2.
CAUTION
To prevent burns, do NOT touch the
engine, exhaust pipe, or other
high-temperature components while
the engine is hot.
1
A. Remove the two bolts and two
compression springs to disconnect the
center exhaust pipe assembly from the
front No. 3 exhaust pipe sub-assembly.
B. Remove the center exhaust pipe
assembly from the two exhaust
pipe supports.
2
1
Compression Spring
2
C. Remove the exhaust pipe gasket from the
front No. 3 exhaust pipe sub-assembly.
© 2019 Lexus, a division of Toyota Motor Sales, USA
1
2
L-SB-0003-18
Rev2
January 25, 2018
Page 4 of 5
Exhaust Drone at Takeoff or Under Light Acceleration
Repair Procedure (continued)
4. Install the NEW center exhaust pipe assembly.
NOTICE
The flexible joint of the center exhaust pipe
assembly may become deformed if
subjected to extreme force.
Do NOT hold the center exhaust pipe
assembly by the flexible joint end.
Do NOT bend the flexible joint excessively.
2
c
1
Flexible Joint
2
Do Not Bend
2
c
A. Using a Vernier caliper gauge,
measure the free length of the
two compression springs.
STANDARD LENGTH
MINIMUM
FREE LENGTH
43.0 mm (1.69 in.)
41.5 mm (1.63 in.)
1
Flexible Joint
2
Do Not Bend
Figure 3.
If the free length is less than the
minimum, replace the compression spring.
B. Temporarily install a NEW exhaust pipe gasket onto the front No. 3 exhaust
pipe sub-assembly.
© 2019 Lexus, a division of Toyota Motor Sales, USA
L-SB-0003-18
Rev2
January 25, 2018
Page 5 of 5
Exhaust Drone at Takeoff or Under Light Acceleration
Repair Procedure (continued)
C. Using a plastic hammer and wooden
block, tap in the exhaust pipe gasket until
its surface is flush with the front No. 3
exhaust pipe sub-assembly.
Figure 4.
1
NOTICE
Be careful with the installation
direction of the exhaust pipe gasket.
3
Do NOT reuse the exhaust
pipe gasket.
Do NOT damage the exhaust
pipe gasket.
Do NOT push in the exhaust pipe
gasket by using the exhaust pipes
when connecting them.
2
1
Front No. 3 Exhaust Pipe Sub-assembly
2
Exhaust Pipe Gasket
3
Wooden Block
D. Connect the center exhaust pipe assembly to the two exhaust pipe supports.
E. Install the center exhaust pipe
assembly to the front No. 3 exhaust pipe
sub-assembly with the two bolts and two
compression springs.
Figure 5.
3
1
Torque: 43 N*m (438 kgf*cm, 32 ft*lbf)
HINT
AFTER installation, check that the space
between the flanges of the center
exhaust pipe assembly and the front
No. 3 exhaust pipe sub-assembly is
consistent front-to-rear and left-to-right.
2
4
1
Center Exhaust Pipe Assembly
2
Front No. 3 Exhaust Pipe Sub-assembly
3
Exhaust Pipe Gasket
4
Space Between Flanges: 8.5 mm (0.335 in.)
5. Confirm the droning noise is reduced.
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TSB/Document ID: L-SB-0003-18_Rev
Replacement Service Bulletin Number:
MFR Communication Date: 2019-08-19
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
MFR Component System:
MFR Component Subsystem:
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