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Discussion Starter · #1 ·
My wife's 2015 GLA 250 4MATIC was lugging and having trouble shifting gears at the right time so checked the computer and saw it was throwing off a P0339 code. So bought a new crankshaft position sensor (fortunately only ~$45) and went to install it but can't find that thing anywhere above or below the car!

Would very much appreciate any help any one can provide on how to locate the sensor and any tips if necessary on how to replace it. Surprising lack of info online for GLAs on this given I believe its fairly common problem.

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