Im going crazy trying to figure this out. Ive searched all over this forum with no results. Please someone try to chime in and help. The scanner reads a po170 (Fuel Trim Malfunction Bank 1). Is this an 02 sensor???

Because of this CEL it seems my Gas MPH has dropped significantly

Car: 2001 Evo 7
Mileage:8,000
Mods: catback,Cone filer, BOV (came with car), everything else. stock.

my gas is killing me and im tired of seeing the light.

Thanks in advance
-kemal

 

what bov? that could trigger this cel as well as some crappy gas mileage.

 

The ****ty SSQ HKS

 

find a DV, stock 9 or aftermarket like forge or synapse asap.

 

i doubt the BOV is causing the CEL though. the scanner reads Bank 1. so it cant be that. i thought it was at first due to the car running rich for a second between shifts

 

Your gas mileage has dropped because your O2 sensor is bad and has your fuel trims pegged rich. It has nothing to do with your BOV.

 

i vented my stock dv because the hose was cracked and got the same exact code.

regardless, he needs a recirculated either way.

 

Check all your IC piping. I was throwing that code and it ended up my IC was starting to get loose at the bottom where it connects to the throttle body (It looked visually fine but I started hearing more noise then normal when boost started to build).

 

Threw this code when J pipe gasket was screwed on my old modded IX turbo. A simple boost leak test found it right away. New gasket from mitsu and I was good to go

Boost leak test the car man

 

thanks people.
much appreciated