Check the vehicle for fault codes to see if there are any sensors were involved to the malfunction of the engine.

1.Local auto parts stores such as Autozone ( not in California) or Advance Auto parts will scan and retrieve any diagnostic trouble codes ( dtc ) stored in the powertrain control module for free of charge..

2. Amazon.com has the code reader for less than $20.00 dollars.

3.Re-post the dtc's in here " answer question " for further assistance.

Note: we need the dtc's to identify the sensor, there are a dozen different sensors to operate the car.

Visit this site and see all the different sensors.

http://www.freeautomechanic.com/car-engine-sensors.html

Navigate to this site and see the code reader
http://www.amazon.com/.../...imh_gw_p263_d2_i1

On a four cylinder engine there is only one bank - the O2 sensor 1 is upstream of the ctalytic converter (nearest the exhaust manifold) and the sensor 2 is downstream of the catalytic converter. The O2 sensors are not difficult to replace - be sure to spray (soak) the old O2 sensor threads liberally with thread lubricant beforehand. Try the 'How-To-Guides' feature on the AutoMD website for the specific steps to replace the O2 sensor.
Try the many on-line auto parts sources, such as; www.RockAuto.com or www.autopartswarehouse.com for the replacement parts.
For example, they (Rock Auto) list the oxygen (O2) sensor (downstream) from around $58.00 for your vehicle.

P2270 = 02 Bank 1 Sensor 2 signal stuck lean

Possibilities;
faulty O2 sensor

The most common issues for lean codes are:

1. Vacuum leaks - check for failed or loose vacuum lines, leaking intake gaskets, intake air tubes loose or any other source of un-metered air leaks (leaks after the Mass Air Flow Sensor)
2. Restricted fuel filter or bent/pinched fuel system lines
3. Incorrect input from other sensors, such as the Mass Air Flow Sensor, which may not always drop a separate code
4. Engine misfire - Yes I know this one may seem weird. You might think that if there is a misfire then you will have all that unburned fuel and it should read rich; right? Well the O2 sensors read only oxygen content in the exhaust, so if you have all that unburned fuel from incomplete combustion then, you guessed it, you also have all that unburned oxygen. High O2 content in exhaust equals a lean reading!

See this How to Stop Car Battery Drains: DIY Auto

There are plenty of energy-robbing devices on your car that are supposed to go to sleep when it's parked, and sometimes, not all of them go to sleep. Here's how to give them a tranquilizer

http://www.popularmechanics.com/.../...ar-battery-drains

I seen water pumps leaking at 10,000 miles others last 150,000 miles.There its no maintenance u do to a water pump,other than checking the drive belts and replacing coolant.Coolant should be done on a regular basis, as per the manufacturer recommendations. Check your owners manual for the maintenance schedule.Clean coolant helps minimize corrosion inside cooling system.Dirty or contaminated coolant may cause the water pump seal to fail and cause a leak.

How many miles? These engines are well known for carbon build-up. Check the mini forums.

Need the trouble codes first. Is this a honda or Mini?

It sounds like the fans are on to cool down the engine just for a min or two.
Is a normal operation of your vehicle.