I've owned my car for a year and half bought it brand new from the dealer put 13xxx miles on it, it's a 09 turbocharged by the way, so I decided to buy a Hahn ram intake as a first upgrade put it on sounds good 3-4 weeks later cel pops up on the dash second 02 sensor wasn't warming up not getting any ohms out of it wouldn't close the loop when it warmed up so I assumed the 02 sensor was bad got a new one from the dealer put it in light shut off right away didn't have to clear it week later cel pops up again scanned it same exact codes same issue. Pulling my hair out please help!

 

what is the code you pulled?

 

Po301 po302 po303 po304

 

well start wit basics check the plugs, coil pacs and wiring harness for injectors, the o2 sensor code might be from all the misfires fouling it up

 

replaced the plugs anyhow they werent bad looked today for two hours no burns or cuts in wiring anywhere took intake off had lil oil in there nothing to write home about it still stumped gonna pull injectors off and clean the seals running outta of ideas

 

All im going to say is Warranty!

 

yeah man, take that **** to the dealership

 

There just giving me the run around throwing parts at it sitting there for days lost cause : (

 

Thats weird that it threw each cylinder misfire indivually. Youd think for multiple cylinder misfires, it would throw the multiple cylinder misfire code P0300.?

 

Could be the other way round too....
O2 sensor bad, go open loop run rich
foul plugs cause misfire.

 

No fouled plugs checked fuse put new 02 in still sAme thing not sure!

 

go to the dealer and tell them youre not taking the car abck till its fixed. Happens 3 times and claim it as a lemon. But put ur stock intake back on

 

not all states have lemon laws...do some research.

 

did you nls when the code came up? have you tried putting the stock intake back on? is that the same code you go last time?

 

And it's not that easy.Have you tried it without the intake on it? Am I also the only one wondering if the fact that you have an intake on an untuned car is causing it?

 

I haven't tried with stock intake yet been at Sebring all week gonna try when I get home but you wouldn't think it would be but who knows!

 

I have a 2007 Chevy cobalt 2.2 4cyl Lt. my check engine light is on, also the traction service light. check engine light is reading PO3O2. I have replaced cylinder number two, spark plug in number 2, fuel injector..not sure what else to do. Cylinder 2 is also getting low compresion of 90.

 

Try going back to stock and see if it helps, after of course replacing the O2 sensor AGAIN.

 

^You know this thread is over 1 1/2 years old right?

 

Next would normaly be the coil pack,
BUUUUUUUUUUUUUUUUUUUUUUTTT...


I'm thinking piston rings, or maybe a head gasket blown....

 

ya, I see what happened now.

Some one descided to use the search function and posted in becuase some oen easle was having msifire problems.


I Guess your damned if you do and damned if you dont.

Not useing search = Starting new thread, getting flamed for starting a thread and not searching

Useing search = necromancing a zombie thread and getting flamed for necroamancing a zombie thread.

 

THIS! Finally someone says it!!!

Lol. Truth though, for sure

 

well lets flame the **** out of them b/c it might be us next time....

 

You have a point lol