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Depends on which computer system you're looking to check. One reason for the cost of the Q45 is the complexity and sophistication of it's on-board computers. In 1996, the Q45 was converted to OBDII (today's general standard for automotive diagnostics). The model years before that will require a Nissan CONSULT, or the Nissan DataScan and cable to interface with the car and allow you to perform PB tests and monitor the vehicle's performance and possible codes. More info can be found at Q45.org and the NICO Q45 Forums.

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Q: How can you check your 1994 Q45 computer system?
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