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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 09-27-2011, 12:31 AM   #1
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Join Date: Sep 2011
Location: akron, oh
Posts: 2
My Ride: 03 325xi
03 325xi throwing catalytic converter code and thermostat code. Need opinions.

Just recently my 325 has been throwing a code that both cats are operating below effiency but there is also a code stating the thermostat is doing the same thing. My thoughts are that because the thermostat is stuck open the car is not getting to operating temp and is running rich which in turn is making the 02 sensors think that the cats aren't doing their job. I hope its the $76 thermostat and not the $350(a piece) cats. Does this reasoning sound valid?

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Old 09-27-2011, 07:13 AM   #2
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Join Date: Apr 2008
Location: Boston
Posts: 4,971
My Ride: 2003 325xi
Post the actual codes. Prob need a therm and 2 o2 sensors.
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Old 09-29-2011, 11:53 AM   #3
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Join Date: Feb 2011
Location: Denver Colorado
Posts: 218
My Ride: 01 325Xi // 86 325e
If your car is getting to temp quickly and staying there it may just be a $15 thermostat temp sensor. Maybe start there and move up.
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Old 09-29-2011, 01:26 PM   #4
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Join Date: Sep 2011
Location: akron, oh
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My Ride: 03 325xi
I don't think it is the sensor because it takes awhile for the engine to get to operating temp and it isn't even operating temp its around 175 F.
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Old 10-03-2011, 02:14 AM   #5
tour(ing) de pantz
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Join Date: Jul 2011
Location: Denver, ColoRADo
Posts: 16
My Ride: '03 325xiT
both of these things could be coolant temp sensor related. start there.
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