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Greg, Technician
Category: Car
Satisfied Customers: 7129
Experience:  17 years Shop Owner /Technician. 27 years experience,
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Error code po306c car runs fine, only comes on when car has

Customer Question

Error code po306c car runs fine, only comes on when car has been driven and engine is hot. Restart light comes on with engine with x thru image
JA: Have you checked the coolant? Have you noticed any leaking?
Customer: None
JA: What is the make/model/year of your car?
Customer: 2014 Mini Cooper s all4
JA: Are you fixing your MINI yourself? What have you tried so far?
Customer: Just reading the code. Light goes off after 10-20 minutes
JA: Anything else you want the mechanic to know before I connect you?
Customer: Check engine light was on with another code. Changed the down stream 02 senor light off
Submitted: 2 months ago.
Category: Car
Expert:  Greg replied 2 months ago.

Hi, I'm Greg (Indy-Tech).
Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Rgds Greg.

Customer: replied 2 months ago.
Still waiting for advise on this issue?
Customer: replied 2 months ago.
I reread the code when the error code came up again. oo87. Low fuel rail pressure. Please response!
Expert:  Greg replied 2 months ago.

Okay sorry did not get back sooner was down feeling a little ill.

Okay both codes make sense first the misfire code P0306 and the P0087 which is a fuel supply issue .

Could be a bad fuel pump bad fuel filter etc,

You need to check the fuel pressure make sure its at the correct fuel pressure if low will trip this code .

May just be a bad fuel pump .


Restricted fuel line
High mileage vehicles or bad fuel
Faulty fuel pump driver module
Weak fuel pump
Restricted fuel pump supply line
Failed fuel pump
Faulty fuel pressure sensor.

For further assistance with this issue please get back to me with the reply box below .
This is not a one answer and done i/we will stay with you until the problem is sorted out .
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Kind regards Greg..