Originally Posted by shorenetworks

Posting this looking for assistance and another set of eyes.

So as of Friday I have a new issues loss of power along with rough idle and visible soot being blown out of the muffler. If RPM's are under 3K I have a difficult time getting above 30MPH also suffering from a random misfire.

So far no codes were generated!!!

Now for the back story, Its a 2011 with 98,000 miles on it and for the past six months I have had codes P0599 for the thermostat control circuit, and a p0420 for a catalytic system below threshold. Car is also suffering from the normal BMW/Mini issues i.e. coolant leaks from water pump.

Yesterday I did some checking and plugs were covered in soot (surprise!!) these were changed around 85,000 miles due to a random misfire.

Did some running evaluations with the scangauge and running issues and visible carbon was only occurring during closed loop operation.

Checked catalytic converter with an infrared thermometer and exhaust tubing was showing 540-600 degrees prior to catalytic converter and about the same right after catalytic converter.

Also Pulled pre catalytic oxygen sensor and discover it was packed in carbon as well.

Ran both plugs and oxygen sensor through a ten minute ultrasonic bath with denatured alcohol.

Upon reinstall and 2nd round of testing had about 5 minutes where car was running with rough idle, visible carbon, and misfire then cleared.

right now car is running at 90% still have a slight loss of power but no carbon and no misfire. I am also able to do well over 30MPH with no issues


At this point I am suspecting a faling pre catalytic converter oxygen sensor along with the catalytic converter being nonfunctional.

What's your thoughts and any other ideas probably will order a pre catalytic oxygen sensor. Also planning on addressing the coolant leak and thermostat issues as well.

Will also say I do love this car but not really thrilled with pretty much all of the exhaust emissions parts failing at this low of milage!!!


Chris

Adding VIN in hopes that the next potential buyer will find this info WMWSU3C54BT182709

Originally Posted by shorenetworks

Just got off the phone with the mechanic 2nd op and confirmed what the dealership has said roughly 2k and will still have outstanding issues. Looks like I will be moving forward with replacing the car. Kicking and screaming the whole way in!!!