Does engine have to be running to do diagnostics

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Last Post 27 June 2019

shaun.gs1000 posted this 27 June 2019

Hi All. have had trouble getting engine started and was wondering if this adaptor will still scan for fault codes if engine not running/started. may seem like silly question but not used one before

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inCarDoc posted this 27 June 2019

To run Diagnostics, car’s ECU must be powered. That could be done when key is switched to ON (or II) just before Start, all dashboard lights are illuminated then.

Thanks.