How do I know if this part needs replacing
Pencil coil insulation can heat-harden and crack, allowing secondary spark to short to ground. Symptoms include engine misfire, especially when cold or under load, a flashing check engine light, and diagnostic trouble codes. OEM coils fit and work right, restore engine performance, and prevent costly catalytic convert damage that can result from persistent engine misfire.
The world's largest supplier of premium automotive parts, Robert Bosch GmbH is headquartered in Gerlingen, Germany, and consists of more than 350 subsidiaries across 60 countries. Bosch products are officially sold in excess of 150 countries worldwide, supported by an employee group of some 303,000.
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