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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 09-13-2009, 07:31 PM   #1 (permalink)
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Fault 2AD8 EAC Sensor Monitoring

2008 328xi NOT under warranty or I would have this at the dealer.

I'm getting a recurring SES light with a 2AD8 Fault - EAC Sensor Monitoring. There is a service bulletin 121607 regarding this exact issue for a ProgMan software fault but it should not be present in cars produced after 8/2007. Mine was produced 4/2008.

Anyone know what the EAC sensor is, where its located, what it does, ????

Thanks for any help you may be able to provide.

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Old 09-14-2009, 07:04 AM   #2 (permalink)
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I would say its Electronic Air Control.......so either its the MAF or the sensor in the side of the airbox if fitted.
Might be worth giving your throttle body a good clean out to as If I remember right there's an air sensor there too.
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Old 09-15-2009, 07:50 AM   #3 (permalink)
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Thank you for the response but I have already eliminated the MAF and there is not other sensor in the air box.

From reading the SBI, the error code it has something to do with the difference between the coolant temp and the ambient temp at startup. However, that could be one of (at least) 5 different sensors.

Any other info would be appreciated.

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Old 09-18-2009, 07:04 PM   #4 (permalink)
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I've done a little more research and an hoping some BMW techs might be able to provide me a clue

I'm getting a recurring SES light due to fault 2AD8 (EAC Sensor Monitoring/Control). There is a SBI 121607 describing this issue for cars produced up to 8/2007 stating implausible temperature differences at startup with the fix being a ProgMan update.

I'm getting this while driving, not at startup and my car was produced 4/2008 so I'm considering the SBI a clue rather than a real solution.

The fault events show the engine temp around 98 - 101 degrees Celsius, coolant temp between 55 - 75 degrees Celsius, and ambient temp around 17-18 degrees Celsius.

The car is a salvage unit. Radiator was replaced with used unit from 2006 328xi and I transplanted a sensor in the original radiator into the 2006 radiator. The thermostat and housing were also replaced with new.

I'm at a loss on what to do next. I'm considering replacing the lower hose temp sensor and the engine temp sensor but I don't want to just throw parts at it.

Any help would be appreciated.

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Old 09-18-2009, 07:40 PM   #5 (permalink)
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How did it end up being a salvage car, if it is a 2008? Wouldn't it fall under warranty no matter what happened?
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Old 09-18-2009, 07:53 PM   #6 (permalink)
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It's a salvage car because it was in an accident and written off by the insurance co.

In my 20 years of experience with salvage cars, the warranty is voided after the car is declared salvage. I've never seen otherwise.

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Old 09-21-2009, 09:33 PM   #7 (permalink)
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Send the last 7 digits of your VIN please so I can identify which engine. My guess is you have a N52KP or N51 engine with MSV80 management system. This car should have a catalyst coated radiator for ozone reduction. I think the fault is most likely related to the fact that you installed a radiator from a 2006 model which would most likely use the MSV70 management and isnt the same.
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Old 09-22-2009, 06:25 AM   #8 (permalink)
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You are correct. I do have the N51 engine and MSV80 in this car. Yesterday I ordered the correct radiator from the dealer and will be installing it as soon as it comes in. Thank you for your response. I'll keep the forum posted on how things work out but it will be around a week before the rad arrives.

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Old 09-28-2009, 05:42 PM   #9 (permalink)
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I installed the new rad and EAC sensor today and cleared the faults. All seems well but the 2AD8 code seemed to crop up only randomly before replacing the rad anyway. After a couple short test drives, there have been no faults logged.

I'll see how things work out over the next week or 2.

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Old 05-25-2011, 08:42 PM   #10 (permalink)
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Same issue

Hey , did you ever get the engine light on again after the new rad?

i'm having the exact same issue, i bought a used radiator and 2 weeks later i got the ses light with the same code///
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Old 05-26-2011, 07:25 AM   #11 (permalink)
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After installing the CORRECT new rad (with the built in EAC sensor) the light never appeared again. What a racket BMW has with these rads. It cost me around $500 (IIRC) just for the rad and about 4 hours of my own labor to install it. Almost any other rad for almost any other car is under $200.

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