Still throwing po455 and po101 after several replacements

Question

I have a 2004 cadillac escalade throwing codes po101 and po455. I have replaced the fuel pump, the gas cap, the evap canister, the evap vent valve. Had the system reset and the check engine light is still coming on. What else should I look at replacing? I have reduced power under stress and shuttering when climbing a hill. Its got 126k, should I look at replacing the spark plugs also?

Answer 1

Hi there,

Here is a list of possible causes for the EVAP code. 

P0455 CADILLAC - Evaporative Emission Control System Leak Detected Gross Leak

Read more: https://www.autocodes.com/p0455_cadillac.html

The code P0101 indicates an issue with the mass air flow sensor. Here is a list of possible causes.

P0101 CADILLAC - Mass Air Flow Sensor Performance

Read more: https://www.autocodes.com/p0101_cadillac.html