A BMW 5 serie 520i 150hp (E39 – 1995 – 2003) makes about 165 hp and 208 Nm with Stage 1 software, compared with 150 hp and 190 Nm from the factory. That is 15 hp and 18 Nm extra.

This is a petrol engine with a displacement of 1,991 cc and engine code 206S3. The engine is controlled by the Siemens/Continental MS41 and Siemens/Continental MS42. The software file can be written with tools such as Alientech KESS3, Alientech KESSv2 and CMD CMDFlash.

Besides Stage 1, the following options are available for this vehicle: DECAT, FLAPS and Vmax.

Frequently asked questions

How much power and torque does a BMW 5 serie 520i 150hp gain with Stage 1?

About 15 hp and 18 Nm: from 150 hp / 190 Nm to roughly 165 hp / 208 Nm. The exact gain depends on engine condition and fuel quality.

Which ECU does a BMW 5 serie 520i 150hp use?

Siemens/Continental MS41 and Siemens/Continental MS42.

Which tools can read a BMW 5 serie 520i 150hp?

Alientech KESS3, Alientech KESSv2 and CMD CMDFlash.

Which extra options are available for a BMW 5 serie 520i 150hp?

DECAT, FLAPS and Vmax.

Figures are indicative and vehicle specific. Check the regulations that apply in your country before modifying engine software.