Problems with P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)

Jorgechon

New member
I recently had a P0433 problem my mechanic had the oxygen sensor changed from the passanger side. Now couple of days later i have a P0423 Heated Catalyst Efficiency Below Threshold (Bank 1).... and he tells me to change the oxygen sensor in the drivers side.

Why didnt i get both obd2 codes at the same time if both were supposed to not be working properly!!
Do you really think that the sensors are the problem??

I drive a 4R 2003 sport edition V6. 4.0.
The dash board tells me that im doing a lousy 11.5 mpg!!

anyone help!!
 
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