Question

2009 BMW X5 with engine codes P124D, P2201, and P2621, looking for help to fix codes

Answer 1

P124D NOx sensor before SCR catalytic convertor

P2201 Nox sensor before DeNOx cat, Plausibilty Nox

P2621 Throttle valve actuator

P2621 is a fault with the throttle valve actuator, when this code condition occurs this disables the ability to do a regeneration in the particulate filter. Satisfy the P2621 code condition and perform a regeneration.

Answer 2

P124D BMW Code - Nitrogen Oxide Sensor Operational Readiness Signal Not Available During Operation
Read more: https://www.autocodes.com/p124d_bmw.html

P2201 BMW Code - NOx Sensor Circuit Range/Performance Bank 1 Sensor 1
Read more: https://www.autocodes.com/p2201_bmw.html

P2621 BMW Code - Throttle Position Output Circuit Low
Read more: https://www.autocodes.com/p2621_bmw.html