S2K Commerce - Products Dropdown
Actions
S2K Commerce - Order Entry
Actions
Sierra Replacement Mercury Outboard Control Module
Mercury V135, V140, V150, V200, XR-6 & 140 Jet Control Module - Sierra 18-99253
The Sierra 18-99253 Control Module is an aftermarket replacement for select Mercury outboard engines using Mercury 857185T1 and related control module applications.
Verified fitment includes select V-135, V-140, V-150, V-200, XR-6 / Magnum III and 140 Jet Mercury outboards.
The original Mercury OEM version of this module is no longer available. Sierra 18-99253 is the available replacement option for these applications.
Mercury has discontinued the original OEM control module used in these applications.
The Sierra 18-99253 is the available replacement for compatible engines that originally used Mercury 857185T1.
OEM & Cross Reference Numbers
| Brand / Type | Part Number |
|---|---|
| Sierra | 18-99253 |
| Cross Reference | 144-7185 |
| Mercury OEM | 857185T1 |
Mercury Outboard Fitment
| Mercury Engine | Serial Number Range |
|---|---|
| V-135 | 0G960500 thru 0T178499 |
| 140 Jet | 0G960500 thru 0T178499 |
| V-140 International | 0T178500 thru 1B226999 |
| V-150 | 0G960500 thru 1B226999 |
| XR-6 / Magnum III | 0G960500 thru 1B226999 |
| V-200 | 0G960500 thru 1B226999 |
Mercury used different electrical components across similar horsepower ranges. Do not order this control module by horsepower alone.
Verify the complete engine serial number and confirm the original module cross references 857185T1 or 144-7185 before ordering.
What This Control Module Does
The control module is part of the engine's electronic control system and helps manage the electrical functions assigned to the module within the Mercury outboard ignition / engine management system.
A failed control module can result in ignition or engine-running issues depending on the exact engine configuration and failure mode.
Common Reasons for Replacement
- Original Mercury module has failed
- Intermittent ignition or engine electrical problem
- Module has visible heat or electrical damage
- Diagnostic testing identifies the module as faulty
- Original Mercury 857185T1 is no longer available
Before Replacing the Module
Electronic control modules should not be replaced solely based on symptoms. Verify related wiring, grounds, connectors, stator / trigger components, charging voltage and other ignition-system components as applicable to the engine.
Follow Mercury service procedures for the exact engine and serial number before condemning the module.
Why Use Sierra 18-99253?
- Sierra aftermarket replacement control module
- Replaces discontinued Mercury OEM 857185T1
- Cross references 144-7185
- Fits select Mercury V-135 outboards
- Fits select Mercury V-140 International outboards
- Fits select Mercury V-150 outboards
- Fits select Mercury V-200 outboards
- Fits select Mercury XR-6 / Magnum III engines
- Fits select Mercury 140 Jet applications
- Available replacement now that the OEM module is discontinued
FAQ
Is Sierra 18-99253 an OEM Mercury part?
No. This is a Sierra aftermarket replacement.
What Mercury part number does 18-99253 replace?
It replaces Mercury 857185T1 and cross references
144-7185.
Is the original Mercury control module still available?
No. The Mercury OEM version is no longer available.
Sierra 18-99253 is the available replacement for compatible applications.
Does it fit Mercury V-150?
Yes. Verified fitment includes V-150 engines from
0G960500 thru 1B226999.
Does it fit Mercury XR-6?
Yes. Verified XR-6 / Magnum III fitment includes serial
0G960500 thru 1B226999.
Does it fit Mercury V-200?
Yes. Verified V-200 applications include serial
0G960500 thru 1B226999.
Does it fit Mercury V-135?
Yes. Verified V-135 fitment is
0G960500 thru 0T178499.
Does it fit a Mercury 140 Jet?
Yes. Verified 140 Jet applications are
0G960500 thru 0T178499.
Should I verify my serial number before ordering?
Yes. Mercury used different electrical components across similar engine
families, so the serial number should always be verified.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed electrical parts are not returnable.
- Return authorization is required before sending items back.
Need help verifying fitment?
Contact Pro Marine
Phone: 941-721-3000
Searchable Terms
18-99253, Sierra 18-99253, 144-7185, 857185T1, Mercury 857185T1, Mercury control module, Mercury ignition control module, Mercury V135 control module, Mercury V140 control module, Mercury V150 control module, Mercury V200 control module, Mercury XR6 control module, Mercury XR-6 module, Mercury Magnum III module, Mercury 140 Jet control module, discontinued Mercury control module, Mercury 857185 replacement, Sierra Mercury control module, 0G960500, 0T178499, 0T178500, 1B226999
857185T1
6E9-W0093-01-00
6E9-W0093-02-00
9-37519
67C-W0001-01-00
67C-W0001-02-00
859352A02
851766
854031
897600
9-44003
854555
875847
876632
9-44005
3322070
33221
35100
35100A1
35567
35568
35840
38737
38739
38740
39758
39761
55483
57980
8M0062614
92834
