BMW 101F01: Meaning, Symptoms and Fix
BMW 101F01 points to Throttle-valve angle and intake-manifold pressure correlation is outside the permitted range. You may only see a warning light, but a methodical check helps you avoid replacing good parts.
BMW 101F01 points to Throttle-valve angle and intake-manifold pressure correlation is outside the permitted range. You may only see a warning light, but a methodical check helps you avoid replacing good parts.
BMW 21A02D points to combustion control is applying a valve-lift correction at idle. You may only see a warning light, but a methodical check helps you avoid replacing good parts.
Understand BMW 2A82, its common symptoms and causes, and how to diagnose it methodically with OBDThink before replacing parts.
BMW 1D2008 points to the characteristic-map thermostat is detected as stuck open. You may only see a warning light, but a methodical check helps you avoid replacing good parts.
245700 and 245800 are six-digit codes reporting an overloaded particulate filter on newer BMW diesels. They are the direct equivalent of 480A/481A on older M57 engines and follow the same two-stage logic.
4501 is a BMW-specific code meaning the DDE could not achieve the EGR flow it asked for. Its generic OBD-II equivalent is P0401 (insufficient EGR flow), and the cause is usually a carbon-clogged EGR valve or intake manifold.
290B00 and 290900 are sibling codes: the DDE compares measured air mass against its calculated value and stores 290B00 when it is too low, 290900 when it is too high. If both set together, look at the measurement or software side.
480A means the particulate filter is heavily loaded and exhaust back pressure has risen; 481A means pressure is above maximum. 481A is usually stored after driving on with 480A, and from then on the DDE blocks regeneration entirely.
278F00 means the swirl flaps in the intake manifold cannot move mechanically. The usual cause is carbon buildup or a broken linkage — and if a flap breaks off and enters the engine, the outcome is very expensive.
4B90 means the DDE has judged the EGR system itself to be faulty. The usual causes are heavy carbon buildup, a seized valve or a failed EGR cooler — and if the cooler has cracked, this is no longer only an emissions issue.
2C57 is a BMW-specific hex fault code meaning the DME could not reach its requested charge pressure. It usually comes from a boost leak, a stuck wastegate or a vacuum problem, and it often arrives together with limp mode.
29CC means combustion misfires on multiple cylinders, while 2ABC means an electrical fault on the charge pressure sensor. When they appear together the order matters: sensor first, misfire second.