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What is a diagnostic code 66 on 1991 Honda Accord?

A diagnostic trouble code (DTC) 66 on a 1991 Honda Accord indicates a problem with the power transistor unit (PTU). The PTU is an electronic component that controls the ignition timing and fuel injection system. When the code 66 is displayed, it means that the PTU has detected a malfunction in the ignition or fuel injection system.

Here are some of the possible causes of a code 66:

- Faulty ignition coil

- Faulty fuel injector

- Open or shorted wiring in the ignition or fuel injection system

- Bad PTU

If your 1991 Honda Accord is displaying a diagnostic code 66, it is important to have the vehicle inspected by a qualified mechanic as soon as possible to prevent any further damage to the engine.

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