I have had the check engine light come on in my car. When I checked the code it showed p1400 manifold differential pressure sensor fault. I changed the sensor out rest the codes and started the car the light stayed off until I started to drive it then it came back on. I checked the vacuum lines for leaks and did not find any I also checked the senor to see if it would hold vacuum pressure. It held at 20 inch pounds I checked the vacuum pressure at the manifold were the sensor mounts. With the car running it was around 17 inch pounds. What else is there to check to find out what is causing this code to come up?
Friday, March 15th, 2013 AT 9:59 AM