B413 · B413 engine brake solenoid cyl 3
Cylinder 3 MX engine brake solenoid group. Intended for B413, P3421, P3423 and P3424 searches plus diagnosis of intermittent retarder complaints.
Defect symptoms
- Engine brake force markedly reduced
- Engine brake cuts in and out on long downhill runs
- DAVIE actuation test on cylinder 3 fails
- Warning comes after repeated brake-switch use
- No drivability issue until engine brake is used