Service Bulletin

25-074

July 28, 2025

Version 1

Oil Leak at Timing Chain Tensioner Inspection Cover
APPLIES TO
Year

Model

2018–26

Accord

2018-22

Engine

VIN Range

1.5L Turbo

ALL

2.0L Turbo

SYMPTOM
Oil leak at timing chain tensioner inspection cover.
POSSIBLE CAUSE
Insufficient sealant adhesion on inspection cover.
CORRECTIVE ACTION
Perform an engine oil leak diagnostic using the Honda Leak Detection Kit in accordance with Job Aid: Diagnosing
Crankcase Leaks with New Engine Oil Leak Detection Kit to accurately identify the source of the leak is the timing chain
inspection cover. Once verified, address the issue by resealing the inspection cover, replacing it if necessary.
WARRANTY CLAIM INFORMATION
1.5L Turbo
Operation
Number

Description

Flat Rate
Time

Defect
Code

Symptom
Code

Template
ID

Failed Part Number

1107A3

Perform an engine oil
leak diagnosis.
Re-seal timing chain
inspection cover

0.6hr

07408

05101

A25074A

11412-59B-000

1101KH

Perform an engine oil
leak diagnosis.
Replace timing chain
inspection cover

0.6hr

07408

05101

A25074B

11412-59B-000

Flat Rate
Time

Defect
Code

Symptom
Code

Template
ID

Failed Part Number

0.7hr

07408

05101

A25074C

11412-RPY-G00

0.7hr

07408

05101

A25074D

11412-RPY-G00

2.0L Turbo
Operation
Number

Description

1107A3

Perform an engine oil
leak diagnosis.
Re-seal timing chain
inspection cover

1101KH

Perform an engine oil
leak diagnosis.
Replace timing chain
inspection cover

CUSTOMER INFORMATION: The information in this bulletin 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 should not be attempted by “do-it-yourselfers,” and you should not
assume this bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact
an authorized Honda automobile dealer.

© 2025 American Honda Motor Co., Inc. – All Rights Reserved

28976

Page 1 of 5

PARTS INFORMATION
NOTE: ONLY order parts if replacing due to damage. Reuse parts when possible.
Engine
1.5L Turbo
2.0L Turbo

Part Name

Cover, Chain Case

Part Number

Quantity

11412-59B-000

1

11412-RPY-G00

1

TOOL INFORMATION
A leak detection kit was auto-shipped to each Honda dealer and is a required special tool. Additional kits can be ordered
through the Honda Tool and Equipment Program at (888) 424-6857. To order on the iN, navigate to: Service>Service
Bay> Tool and Equipment Program, then search for “engine oil leak detection kit”.
Part Name

Part Number

Qty.

LEAK DETECTION KIT

07AAJ-5A2A100

1

Part Name

Part Number

Qty.

Hondabond HT Silicone Gasket

08718-0004

1 tube per 5 repairs

REQUIRED MATERIALS

LEAK DETECTION KIT PREPARATION
Refer to Job Aid Diagnosing Crankcase Leaks with New Engine Oil Leak Detection Kit for information about the kit.
Preparation
• Ensure the supplied air pump is fully charged.
• Ensure the supplied air hose does not have any signs of damage for air to escape.
SAMPLE IMAGE AND VIDEO
Use the following image and video to help identify a leak found by using the Engine Leak Detection Kit. Click the following
link to view the video: Inspection Cover Leak.

Page 2 of 5

INSPECTION PROCEDURES
Some disassembly may be required to access engine components depending on the type of engine being diagnosed.
Refer to the overview image below to perform the following steps.

1. With the engine off and engine cover removed (if applicable), use the metal hose pinching pliers (A) to pinch off the
breather tube and use the plastic hose pinching pliers (B) to pinch off the PCV tube.
2. Remove the engine oil dipstick.
3. Insert the appropriately sized fitting (C) into the engine oil level dipstick hole.
NOTE: The appropriate fitting should engage the same as when inserting the dipstick.
4. Connect one end of the air pump hose onto the small end of the fitting, then insert the other end of the hose to the
supplied air pump.
5. Turn air pump ON.
6. Wait 2 minutes, then confirm the crank case is holding air pressure by pulling the fitting out of the dipstick tube then
listen for a release of pressure. Leave the air pump running during this step.
• If pressure release is heard, replace the fitting then continue with the leak test process.
• If pressure release is not heard, turn the air pump off then check if breather and PCV hoses are properly pinched
and/or blocked off then repeat steps 5 and 6.
7. Remove the right front wheel.

Page 3 of 5

8. Remove the clips and pull down the under body splash shield to access the tensioner inspection cover.

9. Spray the suspected engine oil leak area with soapy water.
10. Look for air bubbles confirming a leak (refer to SAMPLE IMAGE AND VIDEO section on page 2).

Refer to the overview image below to perform the following steps.

1. With the engine off and engine cover removed (if applicable), use the plastic hose pinching pliers (A) to pinch off the
PCV tube.
2. Remove the intake tubing to gain access to the breather tube.
3. Plug the breather tube using an appropriately sized rubber plug (B).
4. Remove the engine oil dipstick.
5. Insert the appropriately sized fitting (C) into the engine oil level dipstick hole.
NOTE: The appropriate fitting should engage the same as when inserting the dipstick.
Page 4 of 5

6. Connect one end of the air pump hose onto the small end of the fitting, then insert the other end of the hose to the
supplied air pump.
7. Turn air pump ON.
8. Wait 2 minutes, then confirm the crank case is holding air pressure by pulling the fitting out of the dipstick tube then
listen for a release of pressure. Leave the air pump running during this step.
• If pressure release is heard, replace the fitting then continue with the leak test process.
• If pressure release is not heard, turn the air pump off then check if breather and PCV hoses are properly pinched
and/or blocked off then repeat steps 5 and 6.
9. Remove the right front wheel.
10. Remove the clips and pull down the under body splash shield to access the tensioner inspection cover.

11. Spray the suspected engine oil leak area with soapy water.
12. Look for air bubbles confirming a leak (refer to SAMPLE IMAGE AND VIDEO section on page 2).
REPAIR PROCEDURE
•
If a leak is found at the Cam Chain Tensioner Inspection Cover, proceed to step 1 below.
•
If any other leak is found, continue with normal troubleshooting.
1. Remove Timing Chain Tensioner Inspection Cover
2. Remove old sealant with a scouring pad from the Timing Chain Cover and Inspection Cover (if reusing original
inspection cover).
3. Apply a 2.5 mm bead of new sealant to the Inspection Cover.
•

2018-22 1.5L Turbo Apply Sealant

•

2023-2026 1.5L Turbo Apply Sealant

•

2018-22 2.0L Turbo Apply Sealant

NOTE: Reinstall the Inspection Cover within 4 minutes of applying the new sealant.
4. Reinstall cover and torque bolts to 9 lbּּ⋅ft.
5. Remove the Engine Oil Leak Detection Kit and reinstall all removed parts in reverse order of removal.

Page 5 of 5