Codes P2195, & P2096: Running lean?
11-06-2009, 05:23 PM
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Codes P2195, & P2096: Running lean?
Whats crackin fellas,
I had just taken off my ZZP 3" catless and returned my stock DP on my car with plans to get an inspection, reset the computer to erase the CEL my catless DP gave me, driving down the road with the stock one on and i get P2195 <- pops up 2x, and P2096. I went under my car, took my O2 sensor out, cleaned it with some degreaser, tightened it back up their real tight. still got the code.
Both are showing lean. Believe one is before cat and one is after cat. I also had that EVAP issue lately where I put gas in my car and it takes 3 cranks to start. then starts up normaly untill I get gas again. Is this related?
Also when driving lately, when lightly accelerating in 3rd or 4th is randomly stutters and hesistates. i release the throttle, touch it again, car starts to shake and it wont accelerate, release gas, hit it again and it will accelerate normally. This leads me to believe its misfiring maybe from running lean? Is there anythign else I can do but take it to my dealer? im on the stock tune and having this trouble. Really dont wanna revert entire car to stock and make a dealer visit. but why would the car be running lean on stock tune with dejon intake, and Injen Charge pipes.
bump
I had just taken off my ZZP 3" catless and returned my stock DP on my car with plans to get an inspection, reset the computer to erase the CEL my catless DP gave me, driving down the road with the stock one on and i get P2195 <- pops up 2x, and P2096. I went under my car, took my O2 sensor out, cleaned it with some degreaser, tightened it back up their real tight. still got the code.
Both are showing lean. Believe one is before cat and one is after cat. I also had that EVAP issue lately where I put gas in my car and it takes 3 cranks to start. then starts up normaly untill I get gas again. Is this related?
Also when driving lately, when lightly accelerating in 3rd or 4th is randomly stutters and hesistates. i release the throttle, touch it again, car starts to shake and it wont accelerate, release gas, hit it again and it will accelerate normally. This leads me to believe its misfiring maybe from running lean? Is there anythign else I can do but take it to my dealer? im on the stock tune and having this trouble. Really dont wanna revert entire car to stock and make a dealer visit. but why would the car be running lean on stock tune with dejon intake, and Injen Charge pipes.
bump
Last edited by Gestapo007; 11-06-2009 at 05:23 PM. Reason: Automerged Doublepost
11-06-2009, 05:57 PM
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it said pre-cat lean though 
ill thro wmy airbox on tommorow and see what happens. you think the dejon could really be throwing it off that much? never had any problems like this in the past 8 months. what would make it suddenly throw a CEL. and also after i cleaned my rear O2 off, its still throwing a lean code back there as well. do you think I fucked it up taking it out when switching my downpipes?
ill thro wmy airbox on tommorow and see what happens. you think the dejon could really be throwing it off that much? never had any problems like this in the past 8 months. what would make it suddenly throw a CEL. and also after i cleaned my rear O2 off, its still throwing a lean code back there as well. do you think I fucked it up taking it out when switching my downpipes?
11-06-2009, 08:20 PM
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yes intakes can **** with it that bad... Remember how shitty my cobalt was running when I was down there? It was due to the intake on it... -20% MAF scaling... meaning the car was 20% too rich due to the intake... threw a code and put me into limp mode.
I have since... had ZERO issues a perfectly tuned MAF table
I have since... had ZERO issues a perfectly tuned MAF table
11-07-2009, 08:56 AM
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how delicate are rear O2 sensors, I had taped it up under the car when i changed downpipes instead of removing it. it was solid, didnt bounce around, and didnt see too dirty when i removed it. threw a CEL obviously b/c of the outside air it was picking up. cleaned it off and put it back in the stock one and its throwing a CEL now. but like I said it also has P2096 which is a Pre-cat lean code. which is being picked up by our wideband on our turbo manifold I imagine. Maybe my rear O2 isnt bad and my car really is running lean, and being picked up by both sensors.
11-07-2009, 01:19 PM
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I honestly do not know how to recalibrate a stock o2... for widebands and such there is usually a recalibration button or sequence.
but yes sence you had it unused and just hanging there... it was using outside and ambient air thinking that is what your WOT AFR was.
makes sence now
but yes sence you had it unused and just hanging there... it was using outside and ambient air thinking that is what your WOT AFR was.
makes sence now
11-07-2009, 01:36 PM
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see i only had it ouside the exhaust for maybe 3 weeks, and all 3 weeks I had a CEL. Leads me to believe if it recalibrated itself the CEL would have went off. Also b/c of the pre-cat lean code, maybe my O2 is fine, and my car is really running lean. What the code actually states (which is weird its not in the sticky for cobalt codes) is that the O2 sensor is not reaching the desired temperature and running lean. Im curious now though, i just put on my stock airbox, went to work, and my car seems to pick up alot more with the stock airbox in. Much more noticable difference in power over the Dejon. takes less pedal to produce more boost. light acceleration is at 0 vac where with the intake is was at maybe -5 vac. Maybe there was a post MAF leak in the intake, which I dont see how unless the silicone coupler was letting air in on the turbo, b/c theres not much after the MAF and b4 the turbo on the dejon intake.
gonna drive it a bit after work and see if anything changes. maybe my CEL will go off, but I doubt it as i believe I have a CEL for 3 codes, 1 pre cat a/f, 1 post cat a/f, and 1 EVAP code. Just got gas ont he way to work and had trouble starting my car. had to give it gas while turning the key to get it to start on the 3rd try. I can tell you 1 thing, my father getting pretty sick of the **** and wants me to stop ******* with my car for good
gonna drive it a bit after work and see if anything changes. maybe my CEL will go off, but I doubt it as i believe I have a CEL for 3 codes, 1 pre cat a/f, 1 post cat a/f, and 1 EVAP code. Just got gas ont he way to work and had trouble starting my car. had to give it gas while turning the key to get it to start on the 3rd try. I can tell you 1 thing, my father getting pretty sick of the **** and wants me to stop ******* with my car for good
11-08-2009, 11:39 AM
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Why would it recalibrate to a 0.00 AFR!
No it thinks you are crazy lean well because there is NO fuel it's sensing... hence your CEL!
You should have had NSI turn your rear o2 off to save your sensor. But when you get up here I can do that for you.
Now the reason it's runing like **** now is for the same token... just in reverse.... it's sensing fuel again... which is ******* it all up... it would be better for your car just to turn it off and leave it haning outside the pipe !
No it thinks you are crazy lean well because there is NO fuel it's sensing... hence your CEL!
You should have had NSI turn your rear o2 off to save your sensor. But when you get up here I can do that for you.
Now the reason it's runing like **** now is for the same token... just in reverse.... it's sensing fuel again... which is ******* it all up... it would be better for your car just to turn it off and leave it haning outside the pipe !
11-08-2009, 01:18 PM
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You could be having the purge valve solenoid problem(its mounted on the side of the engine by the cam cover)
This seems to be the problem with the hard starting after a fill up.
This may be the cause of your other codes some how.
And the part is cheap and easy to change.
This seems to be the problem with the hard starting after a fill up.
This may be the cause of your other codes some how.
And the part is cheap and easy to change.
11-08-2009, 01:20 PM
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I had the rear O2 sensor turned off, but when i swapped ECU's it reset itself and looked for it again. If i turn it off on the stock ECU that would be voiding my warrenty right?
Remember, the whole time i had the rear O2 under the car was with my NSI ECU, then i put the stock ECU in for inspection, reinstalled the O2 sensor, and am now getting CEL's.
with my NSI ECU, i had the O2 sensor turned off, but when i swapped ECU's and then swapped back to the NSI one, it sensed it again, like they just deleted the code, not the O2 sensor
Remember, the whole time i had the rear O2 under the car was with my NSI ECU, then i put the stock ECU in for inspection, reinstalled the O2 sensor, and am now getting CEL's.
with my NSI ECU, i had the O2 sensor turned off, but when i swapped ECU's and then swapped back to the NSI one, it sensed it again, like they just deleted the code, not the O2 sensor
11-08-2009, 01:27 PM
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Right now im pretty much stock besides injen charge pipes. im gonna probobly leave them on as i dont see that as an issue, right? im taking it to marine chevy wednesday and gotta bring Nate, LTZ's, car down to NSI, so ill use that as a daily untill my cars done.
11-09-2009, 12:19 AM
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I'm having the exact same problem. The car will "cough" in example and ill go to hit the gas and its as slow as a base cobalt. If I floor it, my rpd will say 2.3psi as the highest and fall to 0. Then about 20-30 seconds later the car will regain boost and act like nothing happened with 0 codes. Let me know what you find out.
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