At your interval, replacement is your only option, don't bother with trying to re-gap them. They should be changed every 15k. You want Bosch H9DC0...Try your local dealer as most online stores now only carry the resistor HR9DC0.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k