I have a 2001 Blazer LT, 4x4 with a little over 130K miles. I have just recently got two codes I need some information on. The first one is P0453. I know it is a sensor having to do with the fuel system. Where do I look and how hard is it to get to? I tried to clear it with a OBDII reader this morning and it cleared 1 of two. One just flat out refused to go away.

The other is P1416. Not sure about this one. I think it might be a sensor on the passenger side.

If I know what these things look like, I can usually take care of them. I tried reading (and understanding) swartkk's code references, I just got lost.

Any help would be greatly appreciated.

 

P0453 - Evaporative Emission Control System Pressure Sensor High Input
P1416 - Secondary Air Injection [AIR] System Bank 2

The P1416 code indicates that there is something amiss with the AIR system flow to the passenger bank.