Worn spark plug wires may develop micro cracks in insulation on Mercedes-Benz ML350

As the spark plug wires age and are exposed to heat cycling, they start to develop micro cracks in the insulation around the resistors, which causes misfires and poor fuel economy.

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Average mileage: (–)
4 model years affected: 2003, 2004, 2005, 2009 more
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