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  1. General BMW Questions
    This happened to me yesterday. Check engine came on but the car was driving fine. about an hour lately exhaust started to get louder and louder by the minute. My dumbass didn't check the code before pouring a bottle of cata clean with almost an empty tank after thinking the cats were clogged. I...
  2. E46 (1999 - 2006)
    I only need my air cat and o2 monitors to come back on so that I can pass echeck in Ohio. I've tried the drive cycles on the Ohio echeck website, indestructibles, and from BMW themselves. I am currently in collage and need to get the car echecked by the end of the week before I go back to school...
  3. General BMW Questions
    Hi all, Drive Cycle nightmares and misinformation. I have a low mileage X3 that has never had any problems passing emissions. I made the huge (I didn't know what I didn't know) mistake of taking the car to the dealer thinking an oil change was a good idea before the test. $2K later for various...
  4. X5 E70 (2007 - 2013)
    My 2011 X5 xDrive35i Premium sometimes fluctuates between 250 RPM and 500 RPM above the normal idle level ten seconds or so after I start it. It typically only does this upon a cold start, and only once or twice a week. The way it's done is actually more like the car is deliberately revving its...
  5. E34 (1989 - 1995)
    Hey, I have a code coming up on my OBC that says "Catalyst". It happens when I start the car and then it goes away, when I am driving sometime it will randomly come up when I let off the throttle. The Car does Have Catalytic Converters, If I took them out and straight piped it but kept the...
  6. E36 (1991 - 1999)
    After a day of running errands in the rain, the CEL came on on my way home. The code shows: P0430 - Catalyst system efficiency below threshold (bank 2). Does anyone know what this means or what I should start looking for? Thanks!
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