SES light came on the bros Z the other day. Idle was at 1k, dealer hooked up black box and took it for drive with box connected. Readings said the car had backfired.....not. They called NNA tech support, they said check all grounding wires. They found the ground wire from engine to firewall, they cover was corroded. Bad connection. Cleaned and secured connection, reset ecu. runs like a champ. Moisture probably.....too many car washes.....haha
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