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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 08-04-2008, 09:50 PM   #1
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Join Date: Aug 2008
Location: Montreal
Posts: 9
My Ride: 330CI& 2003M3project
Codes p0172 and p0175.running rich...Help please

2001 330CI .codes p0172 and p0175. Could this be the MAF,o2 sensor, OR EVEN a blocked catalytic converter. What I have done do far. Injectors are good, new air filter, plugs good, NEW ELBOW to the TB. Cleaned the ICV valve today, Cleaned the DISA,(air flap in the intake) Cleaned the MAF. Changed the 02 sensor for the 2nd bank(cylindr 4 to 6) The thing is the car runs good.....it lacks power though. Then out of the blue the idle just go's to hell,when this happens i give it gas and it like hesitates like a blocked cat.....BUT then I turn off the car restart it right away and it runs fine....idles around 700. If it was the MAF or 02.....Then why isn't the DME reading faults for those units. Can the DME read a blocked catalytic? I realize that there are 2 02 sensors after the cat! Thanks in advance....
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Old 08-14-2008, 12:35 AM   #2
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Join Date: Apr 2008
Location: Virginia
Posts: 34
My Ride: 2001 330i
if you have an intake and its an oiled intake filter, then you are getting the maf dirty everytime. also check your OS sensors, as well as a stock bmw, even most modified ones cannot run on fuel MORE then 95 octane, and that shitty octane booster can really fuck up our engines, i have a 2001 330i and ran into similar problems, i even drained my fuel tank. also you might need to have your ecu wiped after you fix it.
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