Hi everyone,

I have a 2009 Mini Cooper S Hatchback R56 with 64.800 miles. Three weeks ago the water pipe that connects the water pump to the Thermostat Housing basically exploded, the car overheated and started to shake/misfire. I scanned the car for error codes and I found the codes P0105 (Can’t Measure Air Flow), P0217 (Engine Coolant Over Temp) and Code C3617 (Unknown Issue). I scanned the car again at a later time and I found another error code P0117 (Engine Coolant Temp Sensor). I replaced the water pipe, cleared the codes and the car was running fine. I replaced a week later the “vent hose” that connects the valve cover to the intake manifold because it was broken and it was causing an air leak (there was no air leak after replacing it). A few days later the car started to misfire again. I scanned the car again and found the codes P0117 (Engine Coolant Temp Sensor 1 Circuit Low), P0314 (Single Misfire) and P0205 (Fuel Injector Cylinder 5 Activation). In addition, I found an oil leak from the vacuum pump and after researching about it, I ended up purchasing a vacuum pump O-ring to try to reseal the pump instead of purchasing a new one (as suggested by other members in this forum). I have not replaced the O-ring yet. Yesterday (Monday), another misfire and 4 error codes: P0503 (Speed Sensor), P1497 (Downstream Throttle Air Leak), P0303 (Misfire Cylinder 3) and P0300 (Combustion Misfires Several Cylinders). Now, there is a noise like an air leak coming from around the area where the vacuum pump is located but I do not know yet where exactly the noise/air leak is coming from (I only hear the noise/leak when engine is fully warm). So, It is possible that the code P0503 (Speed Sensor) and P1497 (Downstream Throttle Air Leak) could be caused by the vacuum pump? The car has also a water leak that I'm yet to find. Should I replace the Engine Coolant Temp Sensor? Sorry for the long explanation but I thought that maybe the information can help to determine the cause of the problems.

Thanks.

 

clean the area then clear the codes and start addressing one leak at a time. follow small vacuum hoses and feel everything.

 

Thanks for the suggestions. I will start checking everything tomorrow. I filled the coolant reservoir tank, cleared the codes and the car is running fine. I replaced the Turbo Oil Line recently and to do that I had to remove the Exhaust Manifold Downpipe. I remember that I had some problems with two of the three "stud bolts" and I now smell a leak right where the shield covers the Exhaust Manifold Downpipe. Could this be the cause of the code P1497 (Downstream Throttle Air Leak)?

Thanks.

 

It might be but i doubt it. Check the pipes leading to the throttle body specially the pipe going to the noise maker behind the air intake manifold.

 

My 1497 turned out to be the valve cover. Good luck.

 

Thank you for the suggestions. I already replaced the valve cover about 3 years ago. I checked all the pipes, houses and sensors I could. I think that the error codes and misfire are the consequence of overheating. The car overheated when the water pipe broke down. I replaced the water pipe but there is still a coolant leak. I have not have any misfire and error codes after keeping the reservoir tank with water. I replaced today the vacuum pump O-ring. There is still a noise around the vacuum pump when the car is fully warm. If I find the source I will let you guys know.

Thank you very much for your help. I appreciate it.