P0130 and AFR stuck at 14.7
Thanks for the reply, Lance. Brice got back to me finally from Fitech and said to replace the o2 sensor. I haven't done that yet, but I did pull my connector apart and found corrosion. I've now got the o2 reading, and seems to be reading correctly. All my parameters now read correctly on the handheld, but the truck runs like absolute "crap" with the Fitech on it, anything past 1200 rpm and it starts running like a carb with the choke stuck on, even though my AFR is in the 13-15 range. I put my carb back on just to check, and it runs like a Swiss watch, switch back to the Fitech and runs poorly again. Starting to lose my patience, I've got a new o2 I'm going to put in it tonight to check.
I realize this post is a year old but I ran into a similar problem recently with my O2 sensor on my 30004 as well after only a few months of limited use. Started out OK but over a bit of time it seemed the O2 reading got a bit erratic and or freezing up and the fuel trims would suddenly quit adjusting. It finally give me a P0130 fault code and I decided to just replace it with a Bosch 17014 and so far so good.
The replacement Bosch sensor also appears more stable than the old one ever was and the physical appearance of the sensor tip is different as well with slightly different hole arrangements. Makes me wonder if the sensors that come with the Fitech units are actually a different brand ?
Prior to this I thought perhaps I changed some values it did not like which was freezing my trims. Reloaded my settings and even went back and forth to default as well etc. It appeared to work for a bit sometimes after this so I wasn't sure etc. I'm thinking now it was all to do with the O2 sensor not performing and freezing the fuel trim.
I also found that the sensor element sticks into the pipe quite a ways with the supplied bung (which I welded and not clamped). I have seen different recommendations on this from various sources that say it should not be in the direct stream so am wondering if this was a contributor as well ? When I changed the sensor I welded a slight extension on so that the tip of the sensor just barely protrudes into the exhaust pipe. We will see if all this makes a difference. Maybe I just got a weak sensor. Still working through some settings but other than a few hiccups I am really liking the Fitech so far.
Ok I'm still having this problem with the O2 sensor reading locking up or failing. I put in a brand new replacement Bosch and that seemed to solve my problem initially. Everything worked great for the first drive of a couple hours with the new sensor. AFR was reading correct and the fuel trims were all working. Next day I started up and went to go for a drive and noticed the AFR is stuck at 14.3 and the fuel trim is not working any longer ? ( I have a separate innovate wideband O2 guage for comparison and it was reading correctly around 13.5 idling) Shut it off and restarted and the fitech read an AFR of 17 and it was changing a bit down to 16 etc. My innovate guage was responding reading between 13.5 and 14. Checked the fault code and am getting the P0130 again which won't clear. Tried a reload with my last saved program and restarted...same thing 🙁
So I did some research and found a you tube video of someone with the same thing happening. Random readings of 14 and 16 and no fuel trim etc. The comment was that it was fixed by unplugging the O2 sensor and plugging it back in with the key on. Having two O2 sensors behave the exact after a bit kind of eliminates them.
Anyone else run into these issues ? possible fixes ? I have read info about re-flashing the ECU but have yet to see a procedure for doing this anywhere. Perhaps that will solve this.
Any input would be appreciated.
Update:
Today I fired it up to see and surprisingly the O2 reading and trim were working again and code gone...weird.
I did figure out how to download the hex file to reset completely last night but I tried it again after that and the same problem was there so I give up till morning.
Only thing I did was check over and wiggle the O2 sensor harness wiring where it enters the ECU and checked it down to the sensor connector. I did not disturb the sensor connector or sensor at all. So now I'm thinking a loose or intermittent connection somewhere indicating an open wideband.
I did have to pop off the ECU due to the MAP sensor gasket issue a couple months ago. Perhaps something is pinching or came loose when I re-installed the cover since the sensor wires go into the ECU in this area.