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Think where your O2 senors are.
They are "downstream" of everything.
Many O2 sensor "codes" are caused by the O2 sensor getting a mixture it can't handle. This does NOT mean the O2 sensor is bad.
Many times this is bad MAF sensor. MAF failure is VERY common on M112/3.
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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles
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