Rep Power: 0

ok so a little while back the check engine light comes on, i keep driving. it seemed like the car was using more fuel then usual so i thought maybe the o2 sensor had gone bad, so i replace that. then check engine light stays on, so i replace other o2 sensor, check engine light still on, and it still seems like the car is running a little rich, so i check the spark plugs, they are all different colors almost like a rainbow, and the top of it seems like it was burnt or something. so i replace spark plugs, now it seems like car is using a little less fuel but still more then before, and check engine light is still on, any suggestions?

edit:
oh and accelaration is slower too.

 
Rep Power: 0

Before you spent any money on O2 sensors.... it would have been wise to go have someone read the code from the CEL. Go do that.

 
Rep Power: 0

^^^^yeah definetly have someone run an engine diagnostic.
itll tell you exactly whats wrong

 
Rep Power: 0

i had a similar problem w/ my car. it could be a depleated cat.

 
Rep Power: 0

hmmm...i just looked at your profile. you have a highflow cat?
if you do then thats what is causing the CEL light to come on.
when i took my cat off the car was running rich at idle and lean at WOT. get a o2 sensor simulator. i got mine from Caspers Electronics; it was a bit pricey but well worth it IMO.
no wire splicing either its simple plug and play and they had good customer service.

 
Rep Power: 302

WannaBFast sells them on this site for 20 bucks, and a couple of dollars shipping

 
Rep Power: 0

no, i had the high flow cat forgot to take that off my profile. the check engine light actually came back on after i put my stock exhaust back on, well it was on while i still had the aftermarket exhaust, but it stayed on for some reason. and compared to before i had my exhaust on the car has slower acceleration and uses more fuel then usual. also, how much would it cost to have a mechanic look at the CEL code?

 
Rep Power: 0

Go to autozone... they run diastonics for free....

 
Rep Power: 0

^ ah, thats awsome thanks for the info, what should i ask them for? just go there and tell them that my CEL is on and if they can check out what it is?

 
Rep Power: 0

yeah... just tell em that you have a CEL light and see if they can find out what is wrong..... they should be able to, aslong as your light is on when they go to run the dianostics.

 
Rep Power: 0

k thnx, ill go do that tomorrow, hopefully its nothing too big... thanks to all who responded

 
Rep Power: 0

ok so i went to autozone, and they gave me the codes (po135 and po141) i checked and it means that "Open or short in Primary O2 sensor heater circuit, defective Primary O2 sensor heater circuit". the guy there said that its wierd that this happened on both o2 sensors at once, and he thinks its a fuse. so now which fuse is it? i cant find one for this in the fusebox diagram in the owners manual. anyone know?