Comment on P0172 – System too rich, bank 1 by Joel

J

Joel

Guest
#1
Hello everyone,

I have a 2012 Mini Cooper S R56 that currently has the check engine light on with code P0172 (showing as permanent). So far I have had the high pressure fuel pump replaced, the air intake box, the thermostat/thermostat housing, valve cover gasket (due to leakage during a smoke test), all 4 spark plugs, and both O2 sensors. I have cleaned the MAF with CRC MAF cleaner as well. Even with all of this I have had the light continuously come back on even after clearing all codes. The other codes that tend to pop up along with the P0172 are P0300 (random misfires detected, and those have been on cylinders 1,3 and 4). I had a mechanic look at the cylinders and he said they look good. Also I am not noticing any drastic fuel consumption issues as I can fill up and not have to do so again for 2 weeks (average 26.8 miles a gallon). I have noticed over time black soot on my exhaust as this problem has been going on for the last 6 months. The only things I have left to try are checking all the hoses for a vacuum leak, and possibly replacing the MAF and or cylinders. I am just looking for some advice regarding this issue.

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billr

wrench
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#2
I see lots of parts thrown at this, using live-data might have avoided that. I'm wondering about ECT (especially), IAT, and MAP (if it has that). I gotta say, 26.8 mpg sounds rather poor to me, indicating that it really is running rich.
 

grcauto

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#3
You're going to need a new cat before long. You need to see what the fuel system is doing with a scan tool.