I have a 2007 Ram 1500 Mega Cab that I replaced the fuel pump on, approximately a month ago. Other than being a pain in the butt, everything went well and worked great after the replacement. All of a sudden I received the P0436 code, my fuel gauge quit working, low fuel warning light came on and the check engine light came on. There are no other codes. Any idea why, after a month of driving this would occur? Thanks for the help.

 

Catalyst Temperature Sensor Range/Performance (Bank2)

Ok, that's weird. I suspect it isn't related to the fuel pump replacement at all, and is just a sensor failure. Don't know how expensive they are.....

 

Hmmm, Can you tell me where this sensor is located? I replaced all four O2 sensors about four months ago and that solved one of my previous problems.

I must admit that I am not very mechanical and with this truck having 188k miles,, I am hoping it will be an easy fix/replacement and won't start nickel and diming me to death. Again, thank you for your help.

 

No idea really, but, I would expect it to be on the cat somewhere......

 

Most likely your cat has failed. Do you notice any oil consumption?

 

Haven't noticed anything yet.