Service Engine Soon light 2009 Sentra 2.0: tech said it was P0725 and P0455-- how serious is this?

Question

I did not notice any driving or engine problems.

Answer 1

HI there,

The P0455 code means there is a gross evap or large evap leak. Most of the time on this car it's a problem with the vent control valve and you can drive the car with this code.

P0725 code is the engine speed signal in the transmission control module. This is usually a result of a bad crank position sensor. This one could eventually cause you some issues with the engine starting and running.