P0452 - Evaporative Emission Control System Pressure Sensor Low Input
P0453 - Evaporative Emission Control System Pressure Sensor High Input
The common mistake is the fault codes do not say to replace a part or that one is bad. They never do.
While it is possible the sensor is defective, setting two opposing codes is much more likely to be the result of a wiring or connector terminal problem. Also, problems in the vapor recovery system won't stop an engine from starting and running. For that, a better suspect is a failed fuel pump. A pressure gauge would show the lack of fuel pressure, but you must also check for spark. More crank / no-start problems are caused by a loss of injector pulses AND spark, than are caused by a loss of either one.
Wednesday, April 19th, 2017 AT 2:36 PM