NTK Lambda sensors inside Germany’s most fuel-efficient compact car

The  Polo 1.2 TDI Blue Motion (55 kW, 75 PS) consumed 3.3 litres of diesel – precisely the average value specified by Volkswagen, equalling CO2 emissions of 89 g/km. No other compact car – whether diesel, Otto or hybrid type – was able to beat this figure.

As diesel engines do not operate at Lambda = 1 but usually run on oxygen excess, carburation and exhaust air control create the demand for a wideband (or “linear”) Lambda sensor. These complex sensors are capable of perfectly detecting Lambda values other than the stoichiometric operating point.

For the turbocharged Common-Rail diesel engine which powers the Polo 1.2 TDI Blue Motion Volkswagen selected NTK wideband Lamdba sensors of the most up to date generation, ZFAS-U2, as its exclusive OE-sensor. NGK Spark Plug Europe supplies the sensor in two variants: With the VW part number 03P.906.262.B for left hand drive and – as many VW Polo will be shipped abroad – as 03P.906.262.A for right hand drive. The respective NGK part numbers are UAA0004-VW008 and UAA0004-VW007.

Compared to the earlier generation of wideband Lambda sensors, the ZFAS-U2 stands out because of specific improvements which assist the engine in running as efficiently as possible: The ceramic heater and the ceramic sensor element have been combined into one unit so as to minimise heat loss during heat-up. Only five seconds after the engine starts, the sensor element reaches its operating temperature. In addition, NGK has improved the design of the sensor so that it is now even more resilient to high temperatures and can therefore be situated closer to the exhaust vents where it is exposed to very hot exhaust gases.

 

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