1997 BMW 740 Code 40 and Code 45

1997 BMW 740
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NANCINE1
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1997 BMW 740 V8 134500 miles
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I recently replaced the catalytic converters and front 02 sensors which caused check engine light to go out. After a few hundred miles, light came back on with the 40 and 45 codes.

What do you think the problem is?

update 9/7/08

The extraction method to get the codes was the round device that is attached under the hood and has a hand held scanner/reader that displays service codes. I don't know the name of the device.
Sep 3, 2008 at 2:33 PM
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DOCHAGERTY
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  • 9,606 POSTS
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For me to answer this I need to know what extraction method was used to get these codes.
Sep 3, 2008 at 10:14 PM
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