452A
High452A — Diesel Particulate Filter (DPF) Has Reached End of Service Life
Description
What the Code Means
Code 452A indicates that the diesel particulate filter (DPF) has reached the end of its service life and needs replacement or a forced regeneration. The DPF collects soot, and if regeneration doesn't happen — because of short trips or a faulty injection system, for example — the filter clogs. The fault often comes with higher fuel consumption and reduced power.
Symptoms
Symptoms
- Check Engine light is on
- Reduced engine power
- Higher fuel consumption
- DPF regeneration won't complete
- Exhaust smell
Causes and fixes
Diagnosis and Repair
Step 1
Run a forced DPF regeneration through ISTA/DIS.
Step 2
If regeneration isn't possible, replace the DPF (OEM BMW 18308567244).
Step 3
Check the injection system and the DPF pressure sensors.
Step 4
Reset the DME adaptations.
Possible secondary damage
Secondary Damage
Ignoring the fault can raise backpressure, which damages the turbocharger and increases load on the engine. The DPF can also overheat and catch fire.