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How do I repair a Jeep error code 121?

Error Code 121

Description: Fuel injector control module relay circuit fault

Possible Causes: Fuel injector control module relay circuit Open Fuel Injector Control Module (FICM) Internal circuit failure

Repair:

1. Make sure the fuel injector control module (FICM) relay circuit is not open or shorted. If it is, repair it.

2. If the fuel injector control module relay circuit is good, then the FICM may need to be replaced.

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