P1225 and P1229, throttle body replaced - MINI Cooper Forum

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post #1 of 3 (permalink) Old Mar 19th, 2017, 03:24 PM Thread Starter
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P1225 and P1229, throttle body replaced

Hi Fans!

I'm new to this forum but really excited about my 2002 R53 Cooper S (115k km). As we all do, I love driving it... Until the MIL / EML lights turn on

Recently the P1225 and P1229 fault codes started to show up. Brought the car in to the BMW/MINI dealer and they recommended to replace the throttle body with a new one. (450,-). After two drives the MIL / EML lights started to show up again. To examine the codes myself I've bought a ODB2 device and it prompts the P1225 and P1229 fault codes. As soon as those lights show up, the engine loses a lot of power and will not go above 2000-2500 rpm.

Resetting the ECU removes the error codes but after 3-4 rides the lights starting to turn on again. Really annoying as you can imagine. The dealer had check the wiring and the replaced the entire throttle body.

After resetting the ECU a couple of times a P0638 showed up recently.

What could cause these codes to popup?

(attached a Diagnostic Report form the ODB2).

Attached Files
File Type: zip Diagnostic Report 2017-03-11.html.zip (3.7 KB, 9 views)
hniehorster is offline  
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post #2 of 3 (permalink) Old Mar 21st, 2017, 02:12 AM
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You could have a faulty accelerator pedal and the voltage is fluctuating and causing errors. Check all wiring and plug connections both at the TB and Pedal.

P0638 is Throttle Actuator Control Range/Performance (Bank 1)


If a new TB was installed and the adaptive settings as well as the fault code were not reset, you will still have issues. Clearing the fault code only will not fix the issue once a new TB has been installed, you still need to clear and reset any adaptive settings back to a default setting for it to work correctly. One would assume this would have been done by the dealership but not a guarantee.

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post #3 of 3 (permalink) Old Mar 21st, 2017, 10:40 AM
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Originally Posted by Milpol View Post
One would assume this would have been done by the dealership but not a guarantee.
And we all know how competent the techs at the main dealers are!
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