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I had a 96 Sentra, the 1994 should be the same. The ECU is located under center portion of the dash, atop the transmission hump. It is under a plastic cover box. Getting to the ECU can be a bit of a chore. That plastic cover is held on with screws and the shape and size of it is perfectly made to hardly come out from its place. The ECU itself is bracketed to the floor of the car and the knob on it is in the back, near the firewall. So you have to remove the ECU to turn the knob. As I recall, you gently turn the knob all the way to one side, turn the car on, and the lights on the dash should blink the error code. I think a 55 means that there is no error, which is what I got after all my trouble! But it still beats paying a tech to hook up a computer to tell you the same thing.
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∙ 18y ago
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