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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 10-25-2004, 06:44 PM   #1 (permalink)
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So I went and bought the Peake Research Tool and reset my check engine light after replacing my O2 sensor. Little did I know there was a second fault code:
"3D - After cat oxygen sensor heater, Cyl#4-6"
What the hell is this? How do I fix it? Does this mean that O2 sensor is shot as well?
Any help would be much appreciated.
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Old 10-25-2004, 08:55 PM   #2 (permalink)
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Not sure what you drive but I replaced my O2 sensor and my check engine light went off by itself...Don't think you needed to reset it in the first place.
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Old 10-25-2004, 10:25 PM   #3 (permalink)
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i do believe it does mean that u need to replace the o2 sensor after the catback.. on the exhaust
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Old 10-26-2004, 11:31 AM   #4 (permalink)
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Here's the short story.
Dealer told me the pre-cat sensor was shot so I replaced it. I thought the check engine light would go out by itself but it didn't. The dealer wanted $50 to reset it. That's when I decided to buy the tool. When I reset the light the error code for the pre-cat sensor was gone but the post-cat sensor heater error code popped up.
I drive a 96 328 buy the way.
So it looks like I need to replace another sensor...DAMMIT!
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Old 10-26-2004, 12:38 PM   #5 (permalink)
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Hmm..Yea i has to replace mine at the same time too..than fix a crack in my exh. manifold...after you replace the O2 sensors though it will make a big difference in performance...did on mine anyway...
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Old 10-29-2004, 11:04 AM   #6 (permalink)
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Wooho! I did it!
Bought a used O2 sensor ($60 vs. $200) and replaced the bad one, reset the check engine light and I am good to go.
I was actually surprised at how easy that sucker came loose. I didn't let the car cool down because I didn't have time, just used a pair of gloves so I wouldn't get burned. I think the fact that the pipe was so hot is what did the trick.
And I don't know if it is all in my head but like DeefnDorf said my car does seem to be running better.
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