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Subject: I've ordered many of those parts for my father's 750iL last week. Author: DavidC (moderator) : member since December, 2003 : 11918 posts Posted on: 2007-01-28 14:19:33

I noticed on his car that these two hoses (parts 20 and 21) were severely compromised --- they were so soft you could poke a hole in them with a finger, so I decided to replace them along with all of the other related rubber pieces. Here's the parts list and prices from The BMW Store:

short air hose (cyl 1-6) 11721704306 $4.37
short air hose (cyl 7-12) 11721704307 $4.37
T-connector 11721439973 $0.61
vacuum hose 51731257971 $13.69 (1 meter)
vacuum hose 51731259951 (2) $4.21
vacuum hose 51731259953 $4.21
non-return valve 11611312737 $12.39
support 11731264101 $0.83
container 11611312762 $5.92

I've not yet tested the electric valve (part #11741742712, item 1 in your diagram), but since it's relatively inexpensive at $33.41 and I don't want to have to take everything apart twice, I ordered it, too.

Also going under the knife are the EGR vavles and gaskets at the front of the engine. I should've replaced them last year when I replaced the auxilliary air pump. It appears that the EGR valve system caused the failure of the original air pump, so I hope I've not waited too long.

egr valve (cyl 1-6) 11721704257 $74.12
egr valve (cyl 7-12) 11721704258 $74.12
gasket 11727505259 (2) $3.89

Regarding your question about the SES light, though, you can disconnect the negative terminal of the battery for 10-15 minutes. That should clear the code. I use a Peake R5/FCX-II reset tool.

David Cecil

'97 740iL, 155k miles
'92 750iL, 90k miles
'86 735i, 101k miles

Visit e38.org for everything technical about your BMW

• EGR Update and questions...... (url) - 750il96erbill 2007-01-28 13:11:43 (187 views)
  • You may be on the right track, but that's not an EGR valve... - WillD 2007-01-29 07:16:16 (164 views)
    • Pre-99 does not have EGR like system. Just cold air intake. (nt) - bmw635 2007-01-29 12:47:50 (94 views)
  • I've ordered many of those parts for my father's 750iL last week. (url) - DavidC 2007-01-28 14:19:33 (901 views)
    • BTW, don't forget to order new hose clamps for 11721704306 and 11721704307 (pic) (url) - DavidC 2007-02-01 03:46:11 (157 views)
    • Wow, DavidC, Thanks, as always another great writeup! - 750il96erbill 2007-01-28 14:47:09 (129 views)
      • That's my understanding as well. The switch should only activate when the car is - DavidC 2007-01-28 15:11:50 (98 views)
        • Any ideas on how to test the switch? I unhooked the battery - 750il96erbill 2007-01-28 23:33:54 (84 views)
          • Looks like you finally got to the right part. This system is similar to the smog - bmw635 2007-01-29 02:02:04 (65 views)
          • Check that other hose also down by the AC Comp. (nt) - Roy In GA 2007-01-29 00:30:58 (69 views)
            • I think it's #17. (url) - Roy In GA 2007-01-29 00:38:24 (98 views)
              • Thanks Roy, Peter, DavidC, I am going to drive it, SES - 750il96erbill 2007-01-29 06:35:17 (51 views)
                • I don't know that part so I can't comment- sorry. (nt) - bmw635 2007-01-29 12:46:39 (52 views)
                  • Peter? I understand, but it is a two terminal swtich, should be - 750il96erbill 2007-01-29 13:11:42 (55 views)
                    • Correct about testing circuit but I don't know if normal is close or open. Which - bmw635 2007-01-29 13:21:59 (62 views)
                      • Sorry, it's the switch to control the vacuum going to the valves, number 1 (url) - 750il96erbill 2007-01-29 13:25:05 (114 views)
                        • I think the DME trigger that valve to open on cold engine so I think - bmw635 2007-01-29 13:41:14 (73 views)