Fitting a new oxygen sensor to optimise engine management is often the simplest step to breathing new life into tired engines. The benefits are immediate and measurable:- IMPROVED ENGINE EFFICIENCY, REDUCED EMISSIONS, INCREASED ECONOMY. Now s the time to turn to the world s No.1 in engine sensors. NTK. To ensure the reduction of harmful emissions produced by the internal combustion engine, the lambda or oxygen sensor has become an important piece of technology. As the leading supplier of oxygen sensors both for OEMs and the Aftermarket, NGK is continually improving its oxygen sensors to make engines cleaner and more efficient.