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Discussion Starter #1
I just picked up a 2014 5281 from a dealer and the check engine light is on. I've had this happen to me on a Boxster I owned ten years ago and recently on my Z4 or on a Buick that the 528i replaced. I have an appointment with the dealer service on Tuesday but was wondering if anyone could give me a heads up on what to expect.

Also, I'm looking for a convenient way to store my phone. Removing the inards of the ash tray might work but the bottom piece, which looks easy to remove, doesn't want to budge. Any suggestions?
 

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The CEL (check engine light) is part of the 1996 federal OBD II mandate. It illuminates when one of the many sensors related to emissions has detected a fault.

A simple OBD II scanner/reader would give you the "P" code (the DTC or diagnostic trouble code) that was established to bring a standard across all car manufacturers. Unfortunately for you...California is one of the few states that put a halt to free scanning by auto parts stores like AutoZone, Advanced Auto, Pep Boys, O'Reilly's, etc.

If you know someone that has an simple OBD II scanner...you could plug it into the OBD II port below your dash to pull the code...or you could pick up a scanner online or at your local auto parts store...which would be less expensive than the diagnostic fee you're going to get charged by the dealership just to pull the code.

A simple $20 scanner could do the same thing they're going to charge you over $100 for...and that's before doing any work to fix the issue...which will probably be even more money because they usually replace instead of repair. :(

Without scanning the car...there's no real answer anyone could give you as what to expect because there's just too many different emissions areas that could have set the fault code. It could be something as simple as you didn't screw the fuel cap back on correctly...or it could be an air metering issue, or it could have been a spark plug misfired. Until you scan the car...nobody knows what fault has been set.

The pic below is from my e38's owners manual...but the reason for the light hasn't changed and applies to your f10 5series:



{OBD II mandate that's been around since 1996...see 3rd & 4th bullets in info below}


{DTC breakdown...this is what a simple OBD II "P" code will reveal...which is why without the code no one can tell you what to expect}

 

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Discussion Starter #3
Thanks for the reply. I have an OBD reader. I'll check it tomorrow. The car is under warranty so they will fix it at no cost but I would like to have a bit of a clue before I go in there. It did happen when they were delivering the car so I had to wait while service put it on the computer. 45 minutes later they said the problem was that while on the lot and being test driven it ran out of gas and that's how some air got into the smog system. So I guess they just reset it and sent me on my way hoping the air would work itself out in due time. Well it's noe about 300-400 miles later and still here. We'll see what happens on Tuesday.
 

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I just hooked up the OBD and it read out P12b8. Google says this means the Ambient Pressure Sensor is not to factory specifications. A more detailed explanation say:

1. Faulty Ambient Pressure Sensor
2. APS harness is open or shorted
3. APS circuit poor electrical connection

What seems odd is that before I took it home they brought it back to service and supposedly fixed it. Numbers 2 and 3 look like a quick diagnosis and fix. From my previous experience I would have expected them to apply the fix and then the light wouldn't have come back on if it was a real emission problem. Since the OBD tells me it is not emissions related but equipment related I hope they can explain why they sent me back out with the car. I hope this doesn't indicate the quality of the dealer's service.

Do you know where the APS stuff is and should I check it out to look for loose wires, etc?
 

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I just hooked up the OBD and it read out P12b8. Google says this means the Ambient Pressure Sensor is not to factory specifications. A more detailed explanation say:

1. Faulty Ambient Pressure Sensor
2. APS harness is open or shorted
3. APS circuit poor electrical connection

What seems odd is that before I took it home they brought it back to service and supposedly fixed it. Numbers 2 and 3 look like a quick diagnosis and fix. From my previous experience I would have expected them to apply the fix and then the light wouldn't have come back on if it was a real emission problem. Since the OBD tells me it is not emissions related but equipment related I hope they can explain why they sent me back out with the car. I hope this doesn't indicate the quality of the dealer's service.

Do you know where the APS stuff is and should I check it out to look for loose wires, etc?
That IS an emissions related code. It has a domino effect. If the system can't tell the barometric pressure it doesn't know how dense the air is and then it doesn't know how much fuel to introduce and then how much to advance (or retard) the timing, etc., etc., etc.

Which dealer are we talking about here?
 

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Discussion Starter #6
Thanks for the info. I'm now located in Sacramento area so it is not a SD dealer. BTW, don't leave the SD area unless you have to. Weather is too good!
 

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Thanks for the info. I'm now located in Sacramento area so it is not a SD dealer. BTW, don't leave the SD area unless you have to. Weather is too good!
The weather ain't worth the other crap! I can't wait until its my wife's idea to move to a "free" state!!
 

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Discussion Starter #8
Understand what you re saying. Be careful though. Depends on what you think is "free".If it's money think twice. I've lived all over the US. For instance, in Texas, with no income tax, charged me $600/month for electric in the summer for air conditioning. And that was in 1980. That's at least $2K/month in today's dollars. If free means politics, understand where you are coming from. I just don't read newspapers anymore.
 

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Understand what you re saying. Be careful though. Depends on what you think is "free".If it's money think twice. I've lived all over the US. For instance, in Texas, with no income tax, charged me $600/month for electric in the summer for air conditioning. And that was in 1980. That's at least $2K/month in today's dollars. If free means politics, understand where you are coming from. I just don't read newspapers anymore.
"Free" as in free from socialism. My electric is about $300 and I don't even run the A/C that much; can't afford to. Water is over $100 when I don't water the lawn; close to $200 when I have to. Even at Costco premium is around $3.20 (majors are around $3.50). I'm also pretty tired of 10 months of summer (grew up in SoCal). I have family in Texas and Nevada. They make much less than I do and are doing very well financially. Stardust is talking a special water tax! Well, maybe if they weren't draining the Delta water into the ocean we would have more than enough! I'd also like to be able to defend myself outside of my home. The 2nd amendment isn't optional! This state is just out of control! I could go on...


Back to our regularly scheduled CEL topic.
 

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Discussion Starter #10
I lived in Minnesota for four years. It was much better than Texas. if I could I would move back to SD area. Do not underestimate the value of the weather. it's worth extra costs and political frustrations!
 

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I took the 528 back to the dealer to fix the problem and their fix was reprogram of the computer. Their repair order said they found FC 131908 and then found SIB relevant to client's concern. So they applied the software fix and drove it for about twelve miles and said it was ok. So of course, by the time I got home the light was on again. So I hooked up the OBD again and got the same reading; P12B8 - Ambient Pressure Sensor Overrun Pressure Too Low. So back to the dealer next week.

Where is the Ambient Pressure Sensor? How easy is it to replace it? How much does it cost? Can you say the sensor is bad? Or is it doing its job and sensing a low pressure problem? Does low pressure indicate a leak in the system; like a bad gas cap for instance?
 

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I took the 528 back to the dealer to fix the problem and their fix was reprogram of the computer. Their repair order said they found FC 131908 and then found SIB relevant to client's concern. So they applied the software fix and drove it for about twelve miles and said it was ok. So of course, by the time I got home the light was on again. So I hooked up the OBD again and got the same reading; P12B8 - Ambient Pressure Sensor Overrun Pressure Too Low. So back to the dealer next week.

Where is the Ambient Pressure Sensor? How easy is it to replace it? How much does it cost? Can you say the sensor is bad? Or is it doing its job and sensing a low pressure problem? Does low pressure indicate a leak in the system; like a bad gas cap for instance?
Sounds like a leak to me.

I would recommend taking it to another dealer, if after this many attempts it hasn't been fixed, probably best to take it elsewhere.
 

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Discussion Starter #13
Today I was thinking that I remembered seeing someplace that emission systems have an extended warranty. Does anyone know what the warranty is?
 

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Discussion Starter #16
I wanted to update this thread on my check engine light. The dealer finally decided it was a bad ECU so they replaced it at no charge. They said they were able to do it under the smog warranty although I got a letter a few days later from California that said my warranty claim was denied. I'm not sure what was up with that but I didn't worry about it as I signed off on a NC bill from the dealer.

Thanks to everyone for their contributions.
 
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