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Oxygen Sensor 35668-ZY6-003 – Fits Honda BF115 BF135 BFT150
- $159.77
- $159.77
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How to Match This Part
This aftermarket oxygen sensor replaces Honda Marine 35668-ZY6-003 (Honda LAF / lean air-fuel sensor). It threads into the exhaust passage on selected Honda BF115D, BF135A4, BFT115A, and BFT150A four-stroke outboards and reports exhaust oxygen so the ECM can trim fuel.
Match this part in this order:
1. OEM number on the removed sensor or in your Honda parts catalog (35668-ZY6-003)
2. Model code — BF115D / DK1, BF135A4 / AK2, BFT115A, or BFT150A in the table below
3. Physical connector and thread — compare the product images with the sensor you remove before ordering (sealed 4-pin rectangular plug on a blue-sheathed pigtail)
This is not Honda 35655-ZY3-003 / 35655-ZY3-013 (the oxygen sensor used on BF175 / BF200 / BF225). If your catalog or removed sensor shows a ZY3 number for a V6 outboard, order that listing instead.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers before you order.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| OEM | Honda Marine | 35668-ZY6-003 | Primary reference (LAF / air-fuel ratio sensor) |
| OEM | Tohatsu | HZY635668003 | Equivalent OEM number on Tohatsu-branded applications |
| Aftermarket | Sierra | 18-7659 | Direct aftermarket replacement |
Part numbers are listed for identification only. This is an aftermarket part manufactured by JLM Marine and is not sold as a genuine Honda or Tohatsu component.
Compatible Engine Models
Confirm your engine model code below, then match the OEM number on the sensor you remove. On Honda outboards the identification plate is typically on the stern bracket. Year and serial cut-offs vary by catalog revision, so OEM number match is the safest check.
| Engine Model | HP | Notes |
|---|---|---|
| BF115D / DK1 | 115 | 4-stroke I4 EFI; when catalog/OEM shows 35668-ZY6-003 |
| BFT115A | 115 | 4-stroke I4 EFI; when catalog/OEM shows 35668-ZY6-003 |
| BF135A4 / AK2 | 135 | 4-stroke I4 EFI; when catalog/OEM shows 35668-ZY6-003 |
| BFT150A | 150 | 4-stroke I4 EFI; when catalog/OEM shows 35668-ZY6-003 |
Do not order this sensor for Honda BF175 / BF200 / BF225 applications that specify 35655-ZY3-003 or 35655-ZY3-013.
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Oxygen / LAF (lean air-fuel) sensor for programmed fuel injection |
| Primary OEM number | 35668-ZY6-003 |
| Related Tohatsu OEM | HZY635668003 |
| Electrical connector | Sealed 4-pin rectangular plug on pigtail harness |
| Mounting | Threaded hex body into the exhaust manifold / exhaust passage |
| Engine type | Honda Marine 4-stroke I4 EFI outboard (115–150 HP class when OEM matches) |
| Brand positioning | Aftermarket replacement — not genuine Honda OEM |
Installation Guide
1
Allow the engine and exhaust components to cool fully. Disconnect the battery negative cable before unplugging the sensor connector.
2
Note the harness routing and clip positions, then release the lock tab and unplug the four-pin connector. Unscrew the old sensor from the exhaust boss with an oxygen-sensor socket or slotted wrench on the hex — do not pull on the cable.
3
Confirm the OEM number 35668-ZY6-003 and the sealed 4-pin connector match this assembly and the product images. Keep the sensing tip and protection cap free of oil, grease, sealant, and solvent. Thread the new sensor in by hand to avoid cross-threading, then tighten on the hex per the Honda service manual for your model.
4
Route the pigtail along the original path, reconnect the plug until it locks, restore any harness clips, reconnect the battery, start the engine on a water supply, and confirm there is no exhaust leak at the bung and no oxygen-sensor fault.
Note: Professional installation is recommended to ensure safety and optimal performance.
Troubleshooting & FAQ
Why Choose JLM MARINE?
- Precision Fit: Cross-referenced to Honda 35668-ZY6-003 oxygen / LAF sensor applications on BF115D, BF135A4, BFT115A, and BFT150A.
- Quality Control: Each batch is inspected for dimensional consistency and workmanship.
- Direct from Manufacturer: Aftermarket marine parts engineered for reliable exhaust oxygen sensing on Honda programmed-fuel-injection outboards.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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