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Which O2 sensor is #1??

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Old Oct 15, 2005 | 12:08 PM
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Default Which O2 sensor is #1??
I recently got a 94 BMW 740il, and had a Check Engine light throw code 1221, which is O2 Sensor 1... I have 2, and imagine it is the first one inline with the exhaust... anyone confirm this? Thanks.
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Old Oct 18, 2005 | 07:21 AM
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Hmm... probably have to check a manual... I assume since you have the same motor that I do you have the true dual exhaust with o2 sensors right next to each other right before the cats..
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Old Oct 18, 2005 | 03:29 PM
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Originally Posted by 99TL
Hmm... probably have to check a manual... I assume since you have the same motor that I do you have the true dual exhaust with o2 sensors right next to each other right before the cats..
I have yet to actually get under this car. I have a single pipe muffler, but not sure if they come together under the vehicle. Someone else mentioned that this motor should have them both before the cat...
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Old Oct 20, 2005 | 09:12 AM
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i don't mean to send you away from these forums but for bmw info you might want to try askin on dtmpower.net or bimmerforums.com for bmw related information
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Old Oct 21, 2005 | 06:22 AM
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Originally Posted by Fermunky
I have yet to actually get under this car. I have a single pipe muffler, but not sure if they come together under the vehicle. Someone else mentioned that this motor should have them both before the cat...
there is a single muffler... but it is a true dual exhaust set-up (once again if it is similar to mine which i assume it is) and yes both of the o2 sensors are pre-cat as the car is OBDI.
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2009 Ford Escape - Stock Toy Hauler/DD

2007 Lexus RX350 - Stock Wife Hauler

2009 Kosmic - The Toy - 125cc Vortex Super Rok TAG, (For Sale - $2800)

2007 Intrepid Silverstone - The Faster Toy - CR125 6-Speed
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