Mechanics

CODE 40 AND CODE 45

1997 BMW 740

1997 BMW 740 V8 134500 miles

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.
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Nancine1
September 3, 2008.




For me to answer this I need to know what extraction method was used to get these codes.

Dr. Hagerty
Sep 3, 2008.


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