1997 BMW 740 CODE 40 AND CODE 45

  • Tiny
  • nancine1
  • 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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Wednesday, September 3rd, 2008 AT 2:33 PM

1 Reply

  • Tiny
  • Dr. Hagerty
  • Expert
  • 9,719 posts

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

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Wednesday, September 3rd, 2008 AT 10:14 PM

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