Increased emissions

eridge · 10-29-2019, 04:01 AM

Hey guys!

My increased emissions light came on a few weeks ago. It was throwing codes P0171 (too lean) and P0172 (too rich) but only on bank 1. A day later I also got the P152D; idle air control valve monitors incorrect bank 1. Brought it into my local shop. They got the same codes and said it threw the P0106 map sensor code, so they replaced the map sensor. They said they checked all O2 sensors (on banks/ precat), throttle actuators, and checked for vacuum leaks and couldn't find anything else. They drove it around for a while and the dreaded increased emissions came on again. There are several posts and I've searched and read the other increased emissions threads for hours but can't seem to pinpoint what I've got going on. My shop said if I have any ideas they would take another look at it but they are stumped at the moment. I'd rather not take it to the dealership. Any ideas??

gillara · 02-03-2020, 01:32 AM

How did you fix this problem?

SilverSlug · 09-01-2020, 02:37 AM

Bringing this thread back to life...

Did you ever figure out why the Increased Emissions error popped up?

Was it the Secondary Air Pump valves stuck open?

10-29-2019, 04:01 AM	#1
eridge Registered 0 Rep 1 Posts Drives: 2011 M3 MT Join Date: Oct 2019 Location: Florida iTrader: (0)	Increased emissions Hey guys! My increased emissions light came on a few weeks ago. It was throwing codes P0171 (too lean) and P0172 (too rich) but only on bank 1. A day later I also got the P152D; idle air control valve monitors incorrect bank 1. Brought it into my local shop. They got the same codes and said it threw the P0106 map sensor code, so they replaced the map sensor. They said they checked all O2 sensors (on banks/ precat), throttle actuators, and checked for vacuum leaks and couldn't find anything else. They drove it around for a while and the dreaded increased emissions came on again. There are several posts and I've searched and read the other increased emissions threads for hours but can't seem to pinpoint what I've got going on. My shop said if I have any ideas they would take another look at it but they are stumped at the moment. I'd rather not take it to the dealership. Any ideas??
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02-03-2020, 01:32 AM	#2
gillara Private First Class 19 Rep 102 Posts Drives: 2011 E90 M3 Comp Join Date: Dec 2019 Location: Sacramento, California iTrader: (0)	How did you fix this problem?
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09-01-2020, 02:37 AM	#3
SilverSlug Hey, where have you been all my life? 680 Rep 1,401 Posts Drives: 2011 M3 6MT Join Date: Jul 2018 Location: San Francisco, CA iTrader: (2)	Bringing this thread back to life... Did you ever figure out why the Increased Emissions error popped up? Was it the Secondary Air Pump valves stuck open?
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