I test drove a 2009 325i E90 BMW with automatic transmission. It's done 82k miles and when I pressed kick down the engine management light went on...

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Hi Belal,

I suggest to have the vehicle scanned first for you to check what is causing that engine light to come on. There are several occassions that the engine light is on, it could be and coil issue, injector issue, sensors, HPFP and many more. The reason why the engine light is coming on is there is something wrong with the vehicle and that part might fail soon. 

The cost of the vehicle that you will be buying might be cheap but in the long run you will end up in the car repair and spending over budget. 

Let me know if you have further questions. 

HI Belal, 

the injectors and sensors are the costiest parts not to mention the labor cost as well.

There are cases that clearing the error using the scan tool might fixed the problem. 

Hope nothing major on the vehicle that you are going to buy.Good luck!

Any more questions? 

HPFP means High Pressure Fuel Pump. Try to check that one first before going checking the MAF sensors.