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E90 M3 emissions trouble code thoughts

 
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bond007
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Joined: 27 Oct 2011
Posts: 110
Location: Chapel Hill

PostPosted: Wed Mar 12, 2014 12:44 pm    Post subject: E90 M3 emissions trouble code thoughts Reply with quote

Car seems to drive normally / no limp mode / reduced power.

Initial codes found:
P0030 - HO2S Heater Control Circuit Bank 1 Sensor 1
P0050 - HO2S Heater Control Circuit Bank 2 Sensor 1
P0132 - O2 Sensor Circuit High Voltage
P0171 - System Too Lean Bank1
P0174 - System Too Lean Bank2
P2626 - O2 Sensor Pumping Current Trim Circuit/Open Bank1 Sensor 1
P2629 - O2 Sensor Pumping Current Trim Circuit/Open Bank2 Sensor 1

10 mins after clearing codes:
P0030 - HO2S Heater Control Circuit Bank 1 Sensor 1
P0050 - HO2S Heater Control Circuit Bank 2 Sensor 1
P0132 - O2 Sensor Circuit High Voltage

(One might think O2 sensors are bad)

Then these are added as pending:
P0030 - HO2S Heater Control Circuit Bank 1 Sensor 1
P0050 - HO2S Heater Control Circuit Bank 2 Sensor 1
P0106 - MAP/Barometric Pressure Circuit Range/Performance Problem
P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

(Now the MAP sensor may be the culprit all along or perhaps a vacuum leak?)

If I can't figure it out, I may have to take it somewhere to get fixed/inspected/temporary waiver depending on the parts spend so I can renew the registration...
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2008 E90 M3
2007 MC S
1993 RX-7 - far from stock and hand built
1990 MX-5 turbo - hand built
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bond007
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Joined: 27 Oct 2011
Posts: 110
Location: Chapel Hill

PostPosted: Fri Mar 14, 2014 12:44 pm    Post subject: Reply with quote

It appears as if two new front oxygen sensors was the cure. I used two Denso sensors @ around $100 each. They have the same or very similar part numbers as the BMW OEM I removed (Bosch LSU). It would have been a piece of cake if it weren't for the bracing/skid plate I had to remove to get to the O2 sensor connectors.

Before I reset it after repair, the last batch of codes went to just P0030 and P0050. It seems as if the car will throw and/or clear codes itself. I think the pressure sensor one may have been tripped by a funky idle oscillation (it might need an idle valve).

Parts may be somewhat pricey but at least service is intelligent and reasonable on the E90 chassis.
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2008 E90 M3
2007 MC S
1993 RX-7 - far from stock and hand built
1990 MX-5 turbo - hand built
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jon_335
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Joined: 23 Aug 2005
Posts: 3650
Location: Garner

PostPosted: Fri Mar 14, 2014 11:58 pm    Post subject: Reply with quote

Thanks for posting, Ashraf. I'm just waiting for my time to have problems Cool
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bond007
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Joined: 27 Oct 2011
Posts: 110
Location: Chapel Hill

PostPosted: Sat Mar 15, 2014 6:20 pm    Post subject: Reply with quote

At least the parts will cost a little less for you. Wink
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Visit Radio-Active Car Audio for quality stereo/security/accessories for your vehicle!
2008 E90 M3
2007 MC S
1993 RX-7 - far from stock and hand built
1990 MX-5 turbo - hand built
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