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Mini S Clubman 2010 Fault code 2D90 and 2D50 supposedly both…

Customer Question
Mini Cooper S Clubman...

Mini Cooper S Clubman 2010 Fault code 2D90 and 2D50 supposedly both are "super knock" faults. Drives OK but check engine light comes on while driving

Mechanic's Assistant: Does the light stay on, or does it blink?

Stays on.

Mechanic's Assistant: Are you fixing your Clubman yourself? What have you tried so far?

Just the usual sea foam, etc. Have been told this may be due to carbon buildup on valves?!

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Can a faulty knock sensor cause this fault code?

Submitted: 10 months ago.Category: BMW
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Answered in 36 minutes by:
9/26/2017
BMW Mechanic: Kevin, BMW Mechanic replied 10 months ago
Kevin
Kevin, BMW Mechanic
Category: BMW
Satisfied Customers: 3,115
Experience: Diagnostic technician
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Hi I'm Kevin this will almost certainly be due to carbon build up on valves . If sea foam hasn't worked the intake will have to be removed and valves clean either manually or with a walnut shell blaster

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Customer reply replied 10 months ago
Is it possible that the valves are clean, but the knock sensor is faulty, tricking the dme into reading a "knock" when there isn't any? I mean, if it were really knocking as in "super knocking" we would feel and hear the knock and pinging, almost audibly. Would it be a feasible step to change the knock sensor for a new one and see if the engine light still comes on?
BMW Mechanic: Kevin, BMW Mechanic replied 10 months ago

Of course it's possible just very unusual to get sensor fail. To be honest I've never replaced a knock sensor on one but have on many occasions had to clean intake valves . And you will notice no difference to drive and deffinatly won't hear linking . The car picks up on this way before you will . Have you heard of terraclean ?

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BMW Mechanic: Kevin, BMW Mechanic replied 10 months ago

please remember to rate my service and let me know if you need anything else at all

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