Mini F56 1.5L B38A -130F11 | Exhaust Camshaft Sensor, Plausibility Signal Malfunction

[Mistral]

I am receiving error codes 130F11, indicating an exhaust camshaft plausibility fault, and 120408, which pertains to boost pressure control, specifically a blocked cut-off pressure rise. Research indicates that the boost error arises from the camshaft error rather than the actual defect.

While the engine is idling, I observe the plastic vanos actuator housing oscillating in and out, away from the cam cover. The spring clips are insufficiently robust to secure the housing firmly against the cam cover, resulting in the actuator displacing it instead of actuating the central vanos valve.


It has been recommended that I substitute the huge O-ring (seal) encasing the actuator within the cam cover, as well as the spring clips securing the actuator, due to their tendency to weaken and become more malleable with time.

Has anyone encountered this previously and can confirm if the clips, among other components, serve as the solution?

[jennycarlotta]

The B48 and B38 engines feature a similar timing arrangement, with oil solenoids integrated into the bolts securing the Vanos system at the camshaft's end. A prevalent issue arises when the gauze filters disintegrate, subsequently entering the Vanos sprocket and causing damage. Without visual inspection, it is challenging to assess the situation based on your description. If the electronic component of Vanos control has been displaced from the rocker cover, it may indicate a malfunction, or the plastic of the rocker cover may have become brittle. The timing chains in the B48 engine exhibit superior durability compared to the B38, as the latter's three-cylinder configuration experiences greater wear due to higher revs. The BMW service item for the 100,000 to 120,000-mile interval involves the replacement of timing chains, necessitating the removal of the engine and gearbox. BMW estimates the cost for the B48 chain replacement at approximately £4,000. I completed a few of these jobs last year, initially charging the same as for a diesel engine until I assessed the expenses associated with the chain kit, which is quite costly. This task is not straightforward and requires specialised locking tools; the lase

[jennycarlotta]

If you encounter difficulties in locating someone to assist you, feel free to submit it to me.

[Mistral]

Here is a link demonstrating the motion of the vanos actuator.

[Mistral]

 

[jennycarlotta]

that is unfamiliar to me

[Mistral]

I ponder whether debris from the damaged gauze filter is obstructing the central valve, preventing the actuator from depressing it, hence causing the actuator housing to be displaced outward. I cannot get the reason for its oscillation when idle.

[jennycarlotta]

The issue may lie with the oil solenoid itself, which could be worn internally. The link below contains extensive information on the B48 engine, which shares a similar design but is missing one cylinder compared to yours. It illustrates the solenoid bolts and how the gauze fails; when it does, it directs the gauze towards the sprocket. It is unlikely for it to move in the opposite direction, as oil pressure ranging from 40 to 80 psi propels it one way. To be candid, the B series engines present significantly more challenges during maintenance. The vehicle referenced in the link adhered strictly to the manual, except for the injector replacements. Upon removal, the owner noted a fuel odour and observed a mark on the injector seat to rail. BMW typically replaces the injectors when servicing chains. A colleague at BMW expressed surprise that I managed to extract all four injectors without breaking or damaging them, as each required careful handling and took approximately an hour to remove gently. This vehicle had 118,000 miles; the chain was worn, and the sprockets were in poor condition. The timing ring on the inlet cam was discovered to be loose when heated, resulting in the erosion of the location groove. Additionally, a coolant leak was identified due to the degradation of the plastic oil filter housing caused by age and heat. A colleague at BMW mentioned that the normal cost for chain replacement is approximately $4,000. The last one I completed was half that amount, utilising original equipment parts from INA. INA is imprinted on authentic projects adjacent to the BMW stamp. The INA full kit from Mpd is priced at about fifty percent less than the equivalent kit from BMW, although including identical components manufactured in the same location.