[AHB900]

Hey guys,

Back with a new problem, what else is new. I just got a engine light, I had pep boys scan it for me and they came back with the p12a5 code. Does anybody have an idea what this is about? I will be taking it in to BMW, but wanted to see if anybody has an idea of what it is.

Thanks guys

[SDH]

Typing "BMW P12A5" into Google returns...

P12A5 - Absolute Pressure Sensor, intake manifold, plausibility, shutdown phase : Pressure too high

[SDH]

N55 code list attached (not sure how legit/genuine this is mind), for you error see top of page 2

[AHB900]

Yeah I saw that, but really have no clue what it means. Seems like a boost issue? I also saw something about a wiring harness being defective? Not sure what wiring harnesses and intake manifolds have to do with each other.

[floydarogers]

Originally Posted by AHB900

Yeah I saw that, but really have no clue what it means. Seems like a boost issue? I also saw something about a wiring harness being defective? Not sure what wiring harnesses and intake manifolds have to do with each other.

"Plausibility" means that the computer has a reading that is suspect. In this case, one would posit a fault in either the sensor or the wiring to the sensor.

Lots of self-checking and fail-safe stuff in the system.

[335BOY]

never know when to believe those lights. They flash on every now and then and don't reappear for a few hundred kms. Sometimes re-starting car clears it......random

[MarineOh3]

I had a check engine light come on because I didn't clear snow from the exhaust prior to starting and it tripped a pressure fault. I wouldn't get too excited about the CEL. My understanding is they usually are innocuous and reset themselves within a day. But if it really bothers you, take it in.

[tturedraider]

CEL indicates an emission measurement was out of spec. Usually a small issue, but not 100% of the time. If there's something wrong that would cause damage to the motor a red light would come on. Many times CEL will clear itself after 5 - 6 driving cycles.

[mike@x-ph.com]

Originally Posted by AHB900

Hey guys,

Back with a new problem, what else is new. I just got a engine light, I had pep boys scan it for me and they came back with the p12a5 code. Does anybody have an idea what this is about? I will be taking it in to BMW, but wanted to see if anybody has an idea of what it is.

Thanks guys

You car should be under warranty, get it checked out at the dealership

[AHB900]

the CEL's been on for over a week so I don't think its going anywhere lol. Im going to take it in

[LMK5]

I've got the CEL on now and the dealer said it was the thermostat. The part is on national back order so I have to take the car back to complete the fix when it comes in.

[//M]

Originally Posted by __

CEL indicates an emission measurement was out of spec. Usually a small issue, but not 100% of the time. If there's something wrong that would cause damage to the motor a red light would come on. Many times CEL will clear itself after 5 - 6 driving cycles.

I hear that a bunch on here, so I just want to clarify it's not just for emissions related codes. It's for any engine related code that doesn't require you to stop your drive/replan your day right there, so to speak.


Your somewhat correct though an Idrive message will come up if it is very serious and requires immediate attention.

[AndDown]

Originally Posted by LMK5

I've got the CEL on now and the dealer said it was the thermostat. The part is on national back order so I have to take the car back to complete the fix when it comes in.

Same here, our previous 2013 F30 had the faulty thermostat which was not routing the coolant correctly.