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Old 10-04-2006, 02:04 PM   #1
IndianaTravis
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Default File under "that didn't work"

I had a generic catalytic converter welded into my car on Saturday.

Seemed to work great until this morning, when the CEL came back on.

Wonderful.
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Old 10-04-2006, 06:44 PM   #2
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Originally Posted by IndianaTravis View Post
I had a generic catalytic converter welded into my car on Saturday.

Seemed to work great until this morning, when the CEL came back on.

Wonderful.
ODB II? Check you 02 sensors, before you blame the cat, even a non-BMW cat should work legally they have to. mmmm

If you have a decent mechanic, have them run a reader on the CEL and see what it say the code is.
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Old 10-04-2006, 06:50 PM   #3
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I was warned by the exhaust guy that he has seen this problem before on BMWs. I had him do it anyway. I got about 400 miles out of it since.

I'm going to have the code read and see what it says, and I might must change the o2 sensors anyway.

Some reading on bimmerforums.com indicates there could be an issue with the placement of the cat relative to the second o2 sensor, and that the light will periodically come on. I don't know much about that, but investing in a code reader/reset tool would be a good idea anyway.

No funny smells from the exhaust, and the car is still running strong, so I'm not terribly worried about it, until next year at this time when I have to register the car again!
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Old 10-04-2006, 10:18 PM   #4
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There is a little gizmo that replaces the rear o2 sensor and fakes the computer out. Then you just tie the connector up out of sight.... The issue is that the sensor needs to see certain temps to work correctly which makes placement a bit of an issue.

Dave
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Old 10-05-2006, 04:59 AM   #5
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There is a little gizmo that replaces the rear o2 sensor and fakes the computer out. Then you just tie the connector up out of sight.... The issue is that the sensor needs to see certain temps to work correctly which makes placement a bit of an issue.

Dave
More info on the 'gizmo'?
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Old 10-05-2006, 02:17 PM   #6
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More info on the 'gizmo'?
It's called an O2 simulator. I'm not sure who makes one for BMWs.
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