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#1
09-26-2016, 01:36 PM
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anyone ever cut/splice Oxygen sensor wires?
the wires are longer on the back and have a female end. Anyone ever use front sensors and just spliced onto the old longer wires for the back/post cat sensors? THANKS
__________________
2004, X5, 3.0, 202k+ 
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#2
09-26-2016, 04:24 PM
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Can't say I've done exactly what you are describing... but I have routinely purchased generic Bosch 4 wire o2 sensors and spliced the OEM harness onto them with satisfactory results on other BMW's. Usually saves $40 or so per sensor.
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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#3
09-26-2016, 05:54 PM
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Thanks
retailer on Ebay is telling me they are "interchangeable", no big deal to splice and shrink wrap. My concern was splice/length of wire changing resistance that might be measured by the check system computers.
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2004, X5, 3.0, 202k+
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#4
09-26-2016, 06:01 PM
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You can do it no problem. I have done it a few times for the exact reasons you are thinking. Just solder and shrink wrap and you will be fine. They are all the same other than wire connector and length.
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Dave S. Northeast 2003 4.6is 2005 E53 4.4 2003 E39 Msport(a REAL ONE!) 1959 Fiat 600
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#5
09-26-2016, 06:12 PM
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 +1
__________________
 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#6
09-26-2016, 07:53 PM
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I'm not sure I'd agree 100% with folks. I know in theory it should work but The reason I have never done it is that some cars don't respond well so I never went down the path and the difference in cost doesn't seem worth the extra effort to cut and splice and deal with possible issues
Just my .02
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#7
09-26-2016, 08:45 PM
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For my 2001 3.0i,
pre-cat = Bosch 13477 post-cat = Bosch 15109 universal (for both pre and post-cat) = Bosch 15738 Since the Bosch universal part is same for pre- and post-cat, it seems that yes, your plan will work fine. I have spliced in universal ones on other cars with no problems. I know people report issues, but I assume that is only because they did something wrong (assuming they used the right brand - e.g., a Bosch universal would be fine here). One tip on the splicing: don't cut all 4 wires at the same length. If you do that, you'll have a mega bulge since all 4 connectors will be lined up. If you stagger them so there is no overlap, you'll instead get a longer and thinner mini bulge. Also, put the heat shrink tube (to go around all 4) on there before making the individual connections (of course ... obvious, but easy to forget).
__________________
2001 X5 3.0i, 203k miles, AT, owned since 2014
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