CEL came on today

chuck943 · May 25, 2007

Yeah thats it.
But its not as hard as it seems in the chart. If you drive steady for for about 25 miles after cold start up, with a few miles around 45-50 mph, and a few around 55-65,then make a couple of stops with a couple min. idle time, they will set . You don't really have to concentrate on doing it exactly like the chart says. But fuel level needs to be 1/4 to 3/4 tank and ambient(outside temp) temp needs to be above 40 deg

03redgtstang · May 30, 2007

Hm ok update on this. Curious as to some new info I found out. I took it to a shop which I know and they read the code for me. They had what looked to be a much better and definetly larger scanner and it gave some more detailed info too. It just read Bank 2 Sensor 1 o2 sensor slow to respond. Wouldn't this mean I just switched to a better breathing pipe and I might just need to get the MIL eliminators?

I know its the upstream sensor so you guys said I won't need them because its not my problem but doesnt the front one read the back and back reads front and so on and that could be my problem?

03redgtstang · May 30, 2007

chuck943 · May 30, 2007

no not exactly. that would be the cataylst monitor that compares the front and back. when it runs it is looking for the front O2 to switch several times more than the rear,thats how it knows that the catalytic convertor is working,if it doesn't see the correct ratio it will set codes P0420/P0430.
Did you say you had already tried another O2 sensor?

03redgtstang · May 30, 2007

no i didnt because I figured I would rather throw like 30 bucks at mils than try over 100 at a new 02 and find out I dont need it. But if you're saying still with new info I gave that its prolly the 02 then I will probably go ahead and try that.

chuck943 · May 31, 2007

I am leaning towards this simply because it is the only code you are getting if I am reading this correctly. I would expect to see some other codes like P0171/P0174 if vehicle was actually running lean. If I had it on a scope I could be absolutley sure but just based on the info you have here I would strongly suspect that the O2 has just got lazy.

Twista · May 31, 2007

If i street drive (stop and go) than it doesnt come on till acouple days.

When i drive 1 constant speed on the highway it comes on ASAP.

03redgtstang · May 31, 2007

chuck943 said:
I am leaning towards this simply because it is the only code you are getting if I am reading this correctly. I would expect to see some other codes like P0171/P0174 if vehicle was actually running lean. If I had it on a scope I could be absolutley sure but just based on the info you have here I would strongly suspect that the O2 has just got lazy.

No, well Im not sure but I took it to autozone first before and the guy said po153 but there was still a list of other codes that were on the obdII they were like maf, running lean etc. But he said it was the po153 was the code it was giving, im confused.

03redgtstang · May 31, 2007

03redgtstang said:
Ok guys I just recently put bassani catback and catted x pipe on my 03 gt. Installed about 2 weeks ago and hadnt had a problem. Thursday I took it to a shop to go everything tightened down and have a manifold bolt replaced. Everything was fine until yesterday Friday when my CEL came on. Error code reads P0153 which is 02 sensor/A couple other possible problems. Could the shop have screwed with something? What do you guys recommend checking? Thanks

Thats why in this I said / a couple other problems, I didn't really know why he would say there was 1 code that was thrown but then I also saw a list of other codes like maf and running lean.

chuck943 · May 31, 2007

well that makes a difference.
Do you remember the other codes? If you had a MAF code thats the area u would need to concentrate on. That is were it all starts for the PCM. See the engine is nothing more than a big pump pulling air in and pushing air out. The PCM in order to control combustion has to know exactly how much air the engine is taking in in order to do this, it controls this by reading the O2 sensors, it then makes adjustments accordingly and looks at the O2's to see if that worked. If it is getting a false reading from MAF then it will never make the correction correctly. Do you have a way to look at data logger? That would help alot. Would be very helpful to know what the Baro reading is and also what short and long fuel trims are doing.

03redgtstang · May 31, 2007

data logger?

chuck943 · May 31, 2007

some scan tools will let you look at live data from the sensors so you can see what PCM is seeing. Based on what you told me earlier that you had other codes, lean and MAF, I would suggest you try one more thing and see if it works. Unhook your battery for about 30 minutes so stradegies will reset, while you are doing this clean your MAF sensor with electrical cleaner( make sure that you get any black soot off of sensor wires inside it), make sure it has dried before hooking power back to it, then see if this corrects your problem. If this doesn't work you might ought to let a good professional look at it(not auto zone!!).

03redgtstang · May 31, 2007

Ok Ill give that a go and let you know. BTW I really appreciate the quick responses and great advice man. Im a little new at all this lol.

03redgtstang · Jun 2, 2007

i looked at the maf today and looks as new as they day it was put on. Im gonna get a better scan on it and give exactly what it reads

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