Ok, pulling 4 codes p0101, p0449, p0155, and p0135.
P0101, change maf sensor
P0449 change canister purge solenoid valve
P0155 + P0135 change both sensors
Changing these 4 parts should clear all 4 codes, but
could all 4 codes be pointing to a restricted cat???

 

Eh,not likely. Pick up a can of maf cleaner and spray down the inside of the maf. Mafs can cause some crazy problems.


DONT use carb,brake,throttle body cleaner.

 

I`ve seen one code cause other codes, but not a clogged cat doing this

 

DTC's never tell you to replace a part, never. DTC's tell you what circuit the PCM detected a malfunction on. DTC's must be diagnosed and repaired one at a time, (starting with the first one), using the correct diagnostic flow chart. When the repair is complete, clear all codes and perform a General Motors Driving Cycle. If the check engine light comes back on before, during, or after the drive cycle is completed, retrieve the DTC's and repeat the process until the light stays off after the drive cycle is completed.