240Sx check engine light nissan G - TESTS W/CODES - 240edge.com 1990 Nissan 240SX 1990 ENGINE PERFORMANCE Hard failures cause CHECK ENGINE light (if equipped) to illuminate and remain on until the malfunction is repaired.... Source Source Source Source Source Source Source Source Source Source Read Also: 1990 Nissan 240sx check engine light 1993 Nissan 240sx check engine light Check engine light codes nissan 240sx 1990 Nissan 240sx engine codes 95 Nissan 240sx check engine light 1990 Nissan 240sx ecu codes