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You were told by a so call mechanic that the only way to get a diagnostic or computer reading on a Honda is when the check engine light is on also is the engine suppose to be on or off?
Wiki User
∙ 16y ago
An engine diagnostic computer can be used at any time to tell how an engine is running, a completely different unit is the OBDII code reader which will download trouble codes from the cars onboard computer and is only useful when there is a trouble code reported and the check engine light has been illuminated. Even if the light is now off it will retrieve codes saved in memory from past problems until they are cleared, when using this tool the key needs to be in the run position but the engine does not necessarily need to be running.
The difference between the two tools is their ability to see problems with the car, the diagnostic computer runs about $3000 and can monitor and diagnose any problem with the vehicles drivetrain. The code scanner can be bought for about $80 and will only download trouble codes reported by the cars computer.
Wiki User
∙ 16y ago
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