BMW MS45.0 to MS45.1 ECU CoversionOverview BMW's MS45. 1 ECU runs wideband primary oxygen sensors rather than the narrowband sensors used by MS45. 0. This allows the MS45. 1 ECU to apply fuel trims at full load, ensuring AFR is metered to a precise degree, which is massively important for engine reliability and performance. Unfortunately, ECUs the use narrowband sensors (such as MS43 and MS45. 0) must guess the AFR at full load rather than measure it. This can lead to huge
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