The exhaust system of N43 series engine (with one wide-band probe, one CO catalytic converter and one control probe). Wide-band Lambda probes are placed on the beginning of exhaust system, before CO catalytic converters.Ĭontrol Lambda probes are placed after CO catalytic converters.
The modern BMW engines use 2, 3 or 4 oxygen sensors.Ĥ cylinder engines: wide-band oxygen sensor for each bank (for example, N43 for 1 3 5 series X20i) or one wide-band probe for all cylinders (for example, N43 1 3 series 116i X18i) and a control probe (narrow-band), common for both banks (for example: all N43 series engines) or two control probes (N46 series engine).Ħ cylinder engines: each bank has a wide-band oxygen sensor and also each bank has a control (narrow-band) sensor. The oxygen sensors (Lambda probes) perform the control of exhaust gases and are one of the most important parts of petrol engine.
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