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A few years back I had a similar experience with aftermarket equipment in a VW Passat. A supposedly reputable shop installed an audio amplifier, a few days latter the car was showing the low tire warning light. Next day, the FOB an two power windows stop working. When I took it to the dealer, the engine malfunction light turned on and the car started to misfire. The problem was very simple, the amplifier was not properly grounded
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