E46Fanatics - View Single Post - Pre-cat Oxygen Sensor DIY (lots o pix)
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Old 02-15-2009, 05:09 PM   #51
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Join Date: Mar 2005
Location: Southern California
Posts: 851
My Ride: '04 325i - '08 C300
Originally Posted by charles_316 View Post
The problem is I can't even get the engine started. Can o2 sensors cause the engine to not start? I heard the most likely cause is the intake camshaft sensor but I've already replaced that and the engine still doesn't start. I'm now wondering what to do next - o2 sensors if it is possible that it is the cause
I highly doubt that O2 sensors and regardless of how bad they are will prevent the engine from starting. It might idle rough, it might run inefficiently (waste a lot of gas) but if all you've got are fouled sensors, it will run.

In fact, you could probably disconnect the sensor plugs and it should still start.

Is it not cranking or does it turn but doesn't start?
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