P2091 [0x2091] Mini R56

[21TonyK]

This time its a 2011 R56 Mini One (petrol) which normally runs like a dream despite my tinkering.

P2091 [0x2091]
Camshaft position (CMP) actuator B, bank 1 - circuit high
"B" Camshaft Position Actuator Control Circuit High
Status: Confirmed

So... Google AI () says...

The Mini R56 P2091 code indicates a "B Camshaft Position Actuator Control Circuit High (Bank 1)" malfunction, meaning the engine control module (ECM) has detected a problem with the wiring or the camshaft position actuator on Bank 1 (the exhaust side on an inline engine). The issue could be a failing sensor, a problem with the actuator itself, or a fault within the control circuit. Symptoms may include rough idle, engine stalling, or a check engine light.

On this basis I first removed and cleaned both camshaft position sensors then removed the front (and back solenoid) and checked for continuity.

Now at this point I should be clear I barely understand what "continuity" means other than the needle jumped when I put the multimeters probes on the contacts on the solenoids.

Put everything back, same code. I have now also swapped the camshaft sensors around to see if that changed anything.

Same code.

Car starts and runs, just lumpy idle and very free revving, more so than usual.

I've now ordered...



On the basis if I'm swapping stuff for new I may as well do the whole lot??

Or am I barking up the wrong tree?

To add, car has done 90K with timing chain done at about 70K (or at leat the history shows this). Car sounds like a sewing machine, no rattles or anything but the rocker cover is coming off next week for a new gasket (slight weep on one side) so chain can be looked at then if needs be. (again I can look and poke but thats about my limit).

And, based on previous advice, I did disconnect the -'ve on the battery before doing anything.

[E-bmw]

Top tip #1.

Don't fit non-genuine engine sensors, they are more often than not useless and will rarely last long even if they work when fitted.

[Master Of Puppets]

Also bear in mind the rocker covers on them are prone to warping, a new gasket might not cure the leak, often it's at the right rear.

[21TonyK]

Master Of Puppets said:

Also bear in mind the rocker covers on them are prone to warping, a new gasket might not cure the leak, often it's at the right rear.

I'm going to have a look this afternoon. It appears to have a bit too much gasket sealant on it for my liking, I suspect someone has tried to fix the leak without replacing the gaskets.