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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 03-09-2009, 02:55 PM   #1 (permalink)
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Failed emissions CO% Now what???

Still new to the world of BMW's- after going for my e-test, I passed all areas accept for the CO% AT IDLE. The limit is 0.7 to pass, but i paut out 0.91 . Mechanic suggested running diagnostics- but maybe there is an easier cheaper fix? I do have a OBD ll scanner, but again- I have no warning lights on. It passed at 2500 RPM. I guess it is running rich? I have no codes lighting up- so where should I start?? HELP!
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Old 03-10-2009, 10:57 AM   #2 (permalink)
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328ic98,

Check my response in the newbie lounge.

At idle seems a bit weird... possibly idle vacuum motor or cats blocked.

Did the mechanic check that the O2 sensors on the exhaust actually work?

J.
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Old 03-10-2009, 12:18 PM   #3 (permalink)
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Haha!- I can't even find the Newbie lounge! I don't know if they checked the cats or not. How many o2 sensors are on a 98 328? pricey?
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Old 03-10-2009, 07:59 PM   #4 (permalink)
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From memory those things have 4 sensors.. as it has two cats.. one before each cat, and one after each cat.
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Old 03-10-2009, 09:20 PM   #5 (permalink)
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Sounds expensive! ouch! Thanks!!
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