My check engine light keeps coming on, the error code is Blue Def problem. Blue Def fluid is remaining full, but engine light keeps coming back on, and computer limits starts. The service cannot find a leak, so is the computer bad? The car runs fine, has about 120K miles. Check engine light is my issue... My car has been in for service 3 times, and they can not seem to find a leak. Is it possible the computer is messing up, and there is nothing wrong with the blue Def system? Last time the service department said they would have to start tearing into the engine. Do I need to replace the Blue Def injectore? Thanks!
What makes this problem better or worse?
The engine light just keeps coming on, even after service.
How long has your 2015 Mercedes-Benz GLK250 had this problem?
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Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle.
It sounds like your GLK250 is having an intermittent issue with the DEF system. Since your service department hasn't found a leak, the problem might indeed be with the sensor that reads the DEF level, or the computer itself could be malfunctioning. Another possibility is that the Blue DEF injector is faulty or clogged, leading the system to trigger a check engine light. I would suggest having the sensor and injector thoroughly inspected. It's also worth investigating if a software update for the computer is available, as this could potentially resolve the issue.
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