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Message: <blockquote data-quote="Stranger" data-source="post: 76754" data-attributes="member: 492">This is a trick that existed I think for E39, E46 or even E36.Generally, it shouldn't mess up your car's setting. But I have found there is some adjustment coefficient for fuel consumption (I can't control them) which I have messed up and couldn't set it back. So now I have super good reading on this which is not true.As for the temp, I saw some similar adjustment. So be careful.For E60:Menu 6 is the fuel consumption part. 6.3 or 6.4 is the calculation coefficient  adjustment.Menu 7 is the temp. 7.2 or 7.3 is the adjustment. 7.1 is what I showed earlier.Menu 2 will show you some funky test sequence and you will see your speedo/tacho go maximum. Do this only without starting your engine.Here goes:To navigate:1. The knob on the dash below the speedo is the "button".2. To move from menu 1 to menu 2, you must make sure the content or menu 1 is not shown. When it's shown, a light press of the button will cycle through the sub menus, like 1.1, 1.2, 1.3, 1.1 something like that.3. Hold the button down a bit longer will enable you to move from menu 1 to menu 2 instead of the submenu. When you do that, you will see that the content of the currently displayed menu/submenu disappear. Then each light press of the button will move from menu to menu.To get into the secret menu:1. Press the button before starting the engine and you will see the obc light up; turn the key (without stepping on the brake) without cranking the engine. You will see the secret menu show up. Release the button before it disappears. You are now in the secret menu.2. You must unlock the menu first; otherwise you can only see menus 1, 2, 19, 21 I think.3. To unlock, go to menu 19. Wait for a while, you will see 2nd line as "lock: on", and 3rd line "code: ?" You must key in the code by pressing the button. The code will cycle from 1 to 45 and back. The code is part of your VIN number which will display on menu 1.1 (when you enter the secret menu, leave it there for a while and you should see something like, in my case, B1234567, which is the last 7 chars of my VIN); the code will be 2+3+4+5+6+7 which is 27. Press the button in menu 19 until you see "code: 27"; then stop. The menu reverts to menu 1. To make sure you have unlock, go to menu 19 again, and you should see 2nd line as "lock: no". If it shows "code: ?" again, make sure you hold the button down such that you can move to menu 20 without changing the "code"; otherwise the menu is locked again.So much for the long description; try it; any question I will be happy to answer.  But try it at your own risk.BTW, menu 21 is the master reset. It will ask you to enter your date and time again.</blockquote>

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