Hi z4 lovers. Over the weekend my z4 would not start. I knew the battery was still good but I changed it to a new one anyways, of exactly the same specs. Still the car would crank without starting. Dashboard lights come up normally each time I insert the key fob.
I used the carly app and it kept giving me the A0B4 code. I have attached a screenshot of this down below.
I inspected all the fuses under the glove compartment and also the relay switch of the high pressure fuel pump (HPFP) that is found under the hood of the car. All looks well.
I did some research and apparently there is another fuel pump relay switch in the trunk under the trim on the right hand side of the battery. This is for the low pressure fuel pump (LPFP) that is located inside the fuel tank. This relay switch I haven't had the time to inspect it though. So I am not sure if its a failed relay of the LPFP, a failed LPFP or something else entirely.
On a side note, all this has happened when I left the car sitting for a whole month. Could it be that the car went into anti theft mode perhaps? Or this isn't even something that this z4 model would do?
I am leaning towards a failed fuel pump, the LPFP one but again I am not sure of anything so far. I would also like to ask if there is some very good hand held OBD that you would suggest I can buy to hopefully give me a better insight into the diagnosis. To pinpoint exactly what the problem is that is to say.
Sorry I wasn't short in my explanation but I tried to provide as much information as possible. Any feedback would be greatly appreciated, thank you guys!
I used the carly app and it kept giving me the A0B4 code. I have attached a screenshot of this down below.
I inspected all the fuses under the glove compartment and also the relay switch of the high pressure fuel pump (HPFP) that is found under the hood of the car. All looks well.
I did some research and apparently there is another fuel pump relay switch in the trunk under the trim on the right hand side of the battery. This is for the low pressure fuel pump (LPFP) that is located inside the fuel tank. This relay switch I haven't had the time to inspect it though. So I am not sure if its a failed relay of the LPFP, a failed LPFP or something else entirely.
On a side note, all this has happened when I left the car sitting for a whole month. Could it be that the car went into anti theft mode perhaps? Or this isn't even something that this z4 model would do?
I am leaning towards a failed fuel pump, the LPFP one but again I am not sure of anything so far. I would also like to ask if there is some very good hand held OBD that you would suggest I can buy to hopefully give me a better insight into the diagnosis. To pinpoint exactly what the problem is that is to say.
Sorry I wasn't short in my explanation but I tried to provide as much information as possible. Any feedback would be greatly appreciated, thank you guys!
Scottish Borders
USA