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Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 23587
Experience:  BMW Expert
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99 bmw 323i keep get code p0303

Customer Question

99 bmw 323i keep get code p0303
Submitted: 1 year ago.
Category: BMW
Expert:  Steve replied 1 year ago.
hello
what exactly have you done to try and remedy this?
what question exactly did you have about this?
Customer: replied 1 year ago.
new plug,coil
Customer: replied 1 year ago.
waiting
Expert:  Steve replied 1 year ago.
Hi, I am still not sure exactly what your question is? Did you want to know possible causes?
Customer: replied 1 year ago.
need too fix it
Expert:  Steve replied 1 year ago.
I will provide an honest answer. I trust this will be appreciated. Please remember that a low rating PUNISHES me for being honest and that I receive nothing for my time until a positive rating is clicked.
The most likely cause would be a bad injector on that cylinder or an actual internal mechanical issue with the cylinder. I would suggest swapping injectors and compression testing the cylinder.
Less likely causes would be a wiring or ecu issue.
Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.
Customer: replied 1 year ago.
can a maf set off p0303 if it bad
Expert:  Steve replied 1 year ago.
Please do not forget to CLICK ON a positive rating
No. A bad maf will not set a single cylinder misfire.
As the question has been answered, please kindly CLICK ON a positive rating
Expert:  Steve replied 1 year ago.
if there are no additional questions please do not forget to CLICK ON a positive rating
Customer: replied 1 year ago.
Nocompression
How I get it back
Expert:  Steve replied 1 year ago.
Please do not forget to CLICK ON a positive rating
that is an internal mechanical issue as I correctly identified in my answer.
you can try putting a small amount of oil down the cylinder to see if perhaps the ring is the issue.
if it does not come back then you likely need to have a valve job done.
As the question has been answered, please kindly CLICK ON a positive rating