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Do you have to start your car to do a obd?

Updated: 8/21/2019
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9y ago

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OBD I, you have the key in the on position, and start the engine when queued to do so. ODB II, I believe is more the same. SAE J1939, you just have the key in the on position, and you don't start the engine unless you're doing something like forced regeneration, injector leakage test, dosing injector leak test, fuel rail pressure test, etc.

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9y ago
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Q: Do you have to start your car to do a obd?
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