Originally posted by DesmoBob+Apr 24 2003, 10:13 AM--></span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (DesmoBob @ Apr 24 2003, 10:13 AM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin--ManUtd29
@Apr 18 2003, 11:21 PM
Ok, I was browsing the net and I found this website that will sell it and it seems like its cheap
I found two though, does anyone know which one I would use for my '97 BMW 740iL
Use the site below, and see which one I should order
The page you listed is for a 1995, which is OBD I.
E38 OBD I has two oxygen sensors, and are of different specs from what you need.
You have OBD II, which unfortunately has four oxygen sensors; it has two regulating lambda probes and two lambda monitor probes, for a total of 4. There is a way to test them and pinpoint which one you need, but I only have the Bentley for 3 series, not 7 series, so the readings would be different.
If you let it go, it is true that you will run rich and lower your MPG. But in the long run you can also damage your cat and cause backpressure issues.
If you are replacing one, chances are your mechanic may advise you to replace all four at once, although they charge for each one separately. Go figure.
Here are the OE part numbers. You need two of each, total of four:
11 78 1 247 406 (regulating lambda probe)
11 78 1 742 051 (lambda monitor probe)
Some vendors crosslist OE part numbers with their own stock numbers. Be sure you contact them and verify if these are the ones you need before clicking checkout. [/b][/quote]
Good call Bob..I remember you asking about the lambda sensor's over at the planet a while back..