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#1
03-02-2010, 04:06 PM
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Which oxygen sensor do I need to change?
I got under the X5 and saw two 02 sensors side by side. Is the one for cyl 1-3 the one on the outside, or the one toward the center of the vehicle? Also, which cylinders are 1-3 and which are 4-6? Thanks. 
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#2
03-03-2010, 12:25 AM
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Wouldn't a post cat error mean the cat is not working properly?
__________________
2002 X5 4.6 Sold Dinan CAI, TB, Mass Air, Stage 4 engine & tranny software, X-pipe 2004 745Li 1997 Ford Mustang Cobra Vert 1985 Mazda RX-7 13B-REW single turbo 60-1, Haltech, Meth injection, MSD Ignition, and much more 2008 Mazda Speed3 Hypertech Tune   
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#3
03-03-2010, 01:52 AM
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Need more info on the faults. It could be a o2 sensor aging fault, could be a post cat mixture fault, or could be a catalyst efficiency fault. Need a proper fault description to know where to start looking.
__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#6
03-11-2010, 02:45 AM
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Cyl 1-3 are towards the front of the vehicle/engine on the I6.
__________________
---------------------------------------------- 2006 X5 3.0L - Schwarz Black/Truffle Brown Stock But I keep it clean 
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