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Old 05-21-2015, 03:12 AM   #1
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Join Date: Apr 2015
Location: West Sussex
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My Ride: BMW 318i
BMW 318i - fault code 272c additive adaption bank 1

Hi all

I have a BMW 318i n42 engine and have been having this fault code for about a month now and stuck on what it might be:

272c: Additive adaption bank 1 - control limit reached

Basically the engine is running very rich (about a litre of oil every 500 miles). It also has a rough idle (when engine cold it starts around 1100rpm, then settles around 700rpm). I know that the obvious causes could be; vacuum leak, O2 sensors, maf sensor, ccv. I replaced the ccv and associating pipes last week and still the same. Surely if it was a substantial vacuum leak or faulty maf then it would also trigger the code 272d bank 2? Which makes me think it could be an O2 sensor, but want to be sure to save throwing unnecessary money at it.

Cheers guys
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Old 05-21-2015, 05:24 AM   #2
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 23,247
My Ride: 330CiC, M5, X5, E93
I doubt the engine is running Rich, it is probably running too Lean due to a vacuum leak or maybe even a weak/soft fuel pump.

Do not worry about the MAF at this point.

Get an OBDII smart phone/tablet App and interface, typically $30 or less.

Android - Touch Scan for $3.95 and ELM327 OBDII to Bluetooth interface.

iProduct - OBD Fusion for $9.95 and ELM327 OBDII to Wifi interface.

Read the 2 links below:

Need to see Freeze Frame info if the SES/CEL/MIL is on and Fuel Trim values at both warm idle and a steady highway cruise between 45-60 MPH.

Read this thread -

Make ABSOLUTELY sure the O2 sensor wiring has not been mixed up, read these links:

Read my "BMW 20 Questions" comments in this thread -

Check for or be aware of cracked valve covers and bad valve cover gaskets:

This information ASSUMES that spark plugs have been checked/replaced. If they have not been inspected, you also need to check for oil filled spark plug wells due to a leaking/cracked valve cover gasket.

Search YouTube for Scotty Smoke Test. Do what Scotty does or build a tester from related video. Remove the oil fill cap and make sure the crankcase fills up with smoke, put the oil fill cap back on and check for leaks around the valve cover, oil fill cap, dipstick tube and CCV hoses. Cracked valve covers are pretty common on the E46 as it ages.

Note that the Scotty Smoke Test method is not so good for smaller air/vacuum leaks or fully filling the engine crankcase, for this you really need a smoke machine that can provide a solid and continuous low pressure smoke stream. So plan on building a smoke tester of you thing you will use if more than once or may have smaller and harder to find leaks.
Solve your misfires, lean codes, rough idle -

Fuel pump failures -

Temp Info -

Hidden OBC Menu - Check Voltage, Temp, Fuel Level -

E46/E39 GM5 Door Lock Info -

Lower hose temp switch O-ring - BMW #13621743299
jfoj is offline   Reply With Quote

272c, rich, rough idle

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