Error codes 7E8 and 7E9 are generic codes that can appear on a variety of vehicles. They indicate that there is a problem with the communication between the engine control module (ECM) and one or more of the other modules on the vehicle, or between the transmission control module (TCM) and one or more of the other modules on the vehicle.

The most common causes of these codes are faulty oxygen sensors, malfunctioning catalytic converters, and electrical problems. The first step in fixing these codes is to have the vehicle scanned by a qualified technician. Once the cause of the problem has been determined, the technician can then fix the problem.

There are a few things that you can do to help prevent error codes 7E8 and 7E9 from occurring, such as getting regular tune-ups, inspecting your vehicle regularly, and using quality gasoline.

If you see these codes, it is important to have your vehicle scanned by a qualified technician as soon as possible. The sooner the problem is fixed, the less likely it is to cause further damage to your vehicle.

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