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I just purchased a tuning box for my 2015 GLA45. I was wondering if anyone has any pointers on accessing the boost sensor plug? It's in a pretty tight spot under the brake fluid reservoir.
 

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It seems with many/most vehicle applications of an "octopus" type tuner the lower "tentacle" is the most difficult. Just take your time, don't get frustrated, and ultimately you'll persevere. It's typically one of those things that suddenly slips into place (my Audi experience).
You may want to reference a shop manual to better plot your strategy: GLA45 AMG Service Instuctions
 
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