2002 BMW M5 check engine light on codes 227 and 228

2002 BMW M5
133,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MIKE.SALCIDO
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i have the codes 228 and 227 O2 sensor bank 1 and 2 deviation need help check all data and no codes on there about those code. where should i start looking?
Oct 28, 2008 at 1:16 PM
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DOCHAGERTY
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Mike, can you send the last 7 characters of the vehicle identification number so I know exactly what car we are talking about? Also, what method of code extraction was used?
Oct 28, 2008 at 7:49 PM