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NGK now offering aftermarket Lambda sensors for boat engines


Ignition specialist NGK may be best known for its supply of original equipment (OE) components to the automotive industry, but it is also a leading supplier to other markets.

NGK Spark Plugs (UK) Ltd – the leading supplier of original equipment (OE) spark plugs, glow plugs and NTK Lambda and other engine management sensors – is now for the first time offering the UK aftermarket Lambda sensors for boat engines.

In readiness for the summer season, two Lambda sensors have been made available for popular four-stroke engines from Honda.

Already commonplace for road transport, environmental issues are now beginning to impact off-shore as well.

Engine manufacturers must take appropriate measures to minimise the output of noxious pollutants, in particular of carbon monoxide, nitric oxides and hydrocarbons, while also lowering consumption.

Cars with petrol engines have long since been using Lambda sensors to help with regulating combustion and they can now also be found in a growing number of today’s outboard engines.

Honda was one of the first companies to switch to four-stroke engine technology for its outboard engines and to comply with strict environmental regulations.

Its smaller outboard engines, designated BF75 and BF90, as well as its award-winning, more powerful BF200 and BF225 motors feature the ‘Ecomo’ function.

Aided by a Lambda sensor, they are able to electronically adjust the air-fuel ratio to deliver the desired performance to give maximum engine efficiency and environmental protection.

In contrast to cars, however, Lambda sensors for maritime applications work under the most demanding conditions. Splash water threatens to reach the sensor and destroy the ceramic sensor element, which operates at temperatures of more than 300 °C. Additionally, aggressive sea water can reduce the lifetime of a Lambda sensor.

Honda already uses Lambda sensors from the NTK brand for series production of these engines, but this is the first time that the NTK Lambda sensors for the aforementioned engines have been made available to the independent aftermarket by NGK.

The OZA596-H1 (OE no. 35655-ZY3-013, NGK part no. 90739) is the perfect choice for the Honda outboard engines BF200 and BF225 while the OZA596-H2 (OE no. 35655-ZY9-003, NGK part no. 97490) replaces the original sensor in the Honda engines BF75 and BF90. With the appropriate cable lengths and connectors, both sensors come pre-finished ‘out of the box’.

NGK Spark Plugs (UK) Ltd Marketing Manager Mark Hallam said: “Although we are probably best known for our leading position in the automotive market we also have a strong presence in a number of other sectors, including marine.

“With these sensors, we are addressing a growing demand within the marine market. A demand that we plan to meet with the launch of further Lambda sensors in future.

“As the world’s leading manufacturer of Lambda sensors and partner to virtually all engine makers, we offer the trade and the boat owners uncompromising quality; the quality of a leading supplier to the OEMs.”