Yeah have had my Altima for two years and was driving the other day and noticed that the speedometer was stuck. Called my local mechanic, and asked what he thought it was he said sensor or head, but would need a $79 diagnostic to find out then would need more money to fix. Any ideas? It will randomly work when you drive for more than a hour or so, then it will mess up just as randomly.Also wondering if this will affect an inspection? do they check this kinda thing?