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Yesterday morning the check engine light turned on in my 1997 Nissan Maxima, 127K miles, manual transmission. The mechanic pulled a speed sensor code but it's testing within range now. I was planning to go on a 2-3 hour drive tomorrow. If the sensor fails, what would the typical symptoms be?

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This is what I've gathered so far. Since the car is a manual transmission the speed sensor won't be used for shifting and the speedometer uses a cable, so it should still work too. I think it will drive the same and the only symptom will be not passing smog. Here's to hoping I'm right. – Dan H Jun 28 '11 at 22:52
I think you should re-word the question to focus on asking what symptoms and fixes are available. Asking if the car is OK to drive is off topic. – NoCarrier Jun 29 '11 at 6:00
@NoCarrier Good idea, question updated. – Dan H Jun 29 '11 at 6:46
Update: The speed sensor remains unfixed with no symptoms. The check engine light is still on and could be masking other issues, but it's a risk I'm willing to take. – Dan H Aug 28 '14 at 15:33
up vote 1 down vote accepted

I had a failing speed sensor on a truck and the main symptom was the ABS system kicking on between 3-4 mph when I would come to a stop. It was consistent until I fixed it. However, it did not throw a check engine light.

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Thanks for the input, I'll keep an eye out for that. – Dan H Jun 29 '11 at 15:41

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