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BigBob
BigBob, Service Manager/Technician
Category: BMW
Satisfied Customers: 4837
Experience:  Shop Manager with 25 years experience
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what does teh obd code P1478 stand for?

Resolved Question:

what does teh obd code P1478 stand for?
Submitted: 7 years ago.
Category: BMW
Expert:  BigBob replied 7 years ago.
Greetings,


This code is for a very small evaporative emissions leak.

P1478 146
Evaporataive Emission
System Leak Detected
(very small leak) MS42, Engine: M52LEV L6 2.8 ? , from 01.06.98 till 31.05.99
P1478 146
Evaporataive Emission
System Leak Detected
(very small leak) MS42, Engine: M52LEV L6 2.8 ? , from 01.06.99 till 31.10.00

The first thing to check for this code is a [possible loose gas cap. If the gas cap is ok you will need to pressure test the system.


Let me know if I can help further,
Bob

Customer: replied 7 years ago.

Does this affect how the engine runs? I also got the P0301 code and this tells me cylinder 1 misfire. I just replaced the spark plug on the first cylinder from the front of the engine. Is this the location of cylinder 1? If not, what is the cylinder number sequence and orientation? Please advise.

Expert:  BigBob replied 7 years ago.
No this code will not cause a drivability issue. Try swapping the ignition coil with another cylinder and see if the code p0301 changes cylinders, if it does then the coil you moved is bad. Yes that is the #1 cylinder.

graphic

Good luck,
Bob
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