03-09-2013, 10:01 PM
Join Date: Mar 2013
Terrible MPG performance 2005 Forenza - replacing O2 sensor
Hello guys/gals, first time on this board and glad to be here!
In a nutshell I have a 2005 Suzuki Forenza and I am experiencing very poor MPG; I get 11 to 12 miles per gallon in the city, which is horrible.
Now I want to replace my o2 sensors to see if this may resolve the issue. My question is how many O2 sensors are there in the 05 Forenza. And which one is the main 02 sensor that i should replace? Is it the one right in front of the engine or the one below underneath the car near the cat converter?
FYI, I did a engine diagnostic and I came up with code P0420. But I don't know how having a bad/poor catalyst converter will effect fuel efficiency.
- Have terrible MPG on my '05 Forenza; 11-12 MPG in the city
- Want to change 02 sensor
- Don't know how many 02 sensors there are, and which one should I replace
- Did a computer diagnostic and getting P0420 for cat converter below threshold efficiency