Question

On my 2007 MINI Cooper S 1.4L, what causes the P129D code?

Answer 1

Check the Manifold Absolute Pressure Sensor wires for damage, if the wires are OK, then you must replace the Manifold Absolute Pressure Sensor to fix the problem.

P129D BMW - Manifold Absolute Pressure Maximum Pressure Implausible
Read more: https://www.autocodes.com/p129d_bmw.html

Answer 2

* MINI DTC P129D (0x2B73) - Manifold Absolute Pressure (MAP) Maximum Pressure Implausible

Not entirely sure of the specific cause yet.