O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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P1132 - Powertrain Those four fault codes just will not go away. I've replaced all O2 sensors, replaced the EGR Pressure Sensor. cleaned the MAF (which wasn't that old anyway, and wasn't dirty at all), and replaced the old spark plugs. I've also read that sometimes the OEM alternator causes voltage irregularities which could cause the injectors to fire too much fuel, so I replaced that as well. After 150 miles the fault codes still keep coming back every 20 miles or so. I pulled the plugs and they are running perfectly - no white residue (if it ran lean) and no black buildup (if it ran rich). Here's a picture of the spark plug from cylinder 4 after 150 miles, http://i.imgur.com/AXK59.jpg As you can see it's running just fine. There's no signs of the motor running rich at all - no lack of power, no smoke from the exhaust, etc. What else could it be? Bad MAF? Bad PCM? After $135 for the alternator, $60 for each O2 sensor, $62 for the EGR pressure sensor, funds to keep throwing parts at it are getting dry. :confused: Gas mileage is pretty average, getting about 12-13mpg around the neighborhood and around town. Just trying to get this bloody CEL to go away. :mad: :beerglass::beerglass::beerglass: all around to the one who can figure what what's going on here! |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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What you need to do is take a deep breath and not throw anymore parts at it.... Rent or buy a scanner that reads live data so you can see if the O2 sensors are in fact working like they should... We are all going to need alot more info about your truck, ie, Engine, Trans ,rear gearing ,4WD or 2WD and Year ...to really help you..!! |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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I have a scanner that can read PID data. The O2 sensors are brand new and are functioning correctly according to the PID data. It's a 2001 base model. Transmission and rear end aren't even nearly related so I figured it was unnecessary information. Since you asked, though, it's an automatic with 3.73 rear end, 2WD. |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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And you MAF sensor reading??? Engine type.?? The MAF sensors are NOT the same between the various engine as they have different calibration curves. |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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Here's some PID data. O2 sensors are switching correctly. It's a non-FFV 3.0 Vulcan. Running: http://i222.photobucket.com/albums/d...0-22-34-11.png Bank 2, Sensor 2 always stays at 1.27v. There's only 3 O2 sensors on my truck. Any ideas? O2 sensor data graph (shows everything normal): http://i222.photobucket.com/albums/d...0-22-44-46.png The fault codes: http://i222.photobucket.com/albums/d...0-18-24-59.png |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
O2 sensor bank 2 ,sensor 2 ... is way too high!!!
There's a conflict between sensor 1 and 2 on bank 2... 0.15 = lean and 0.85 = rich Bank 1 looks fine....Bank 2 running rich.. |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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And the fault codes are saying that both banks are indicating rich. No idea why it's saying "lack of heated upstream oxygen sensor switch", as if it thinks there's no O2 sensors on there at all?? :confused: |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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Your base voltage is 0.45v and will swing as high as 0.85v and as low as 0.15v. I would take a look at long term and short term fuel trims too, to see whats going on there too. ---------- On a stock exhaust system on fords on all the V6s that I've seen, there should be four O2s, two up stream and 2 down stream of each CAT. I tell you I'm confused !! |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
Wait a minute. Lets back up here. Look at the information you've posted. You've shown that a non-existent sensor is reporting an overly rich condition to the computer. And you're trying to correct that overly rich condition. Hello. You're trying to fix something that doesn't exist!!!
I can tell you EXACTLY what is going on here: You have a fourth oxygen sensor that isn't hooked up due to your aftermarket exhaust system. It's either dangling down somewhere, or the wires are taped off and corroding with water in them. This is resulting in the computer receiving what it interprets as an extremely rich condition on that sensor's circuit. This is causing the P0175 in bank 2. Due to this false rich condition, the computer is leaning out the fuel trim to it's maximum limits. This is why those plugs look so clean with no fuel on them, you're engine is running dangerously lean. Shit is going to start going fukushima in there soon. With fuel trim leaned out all the way, the sensor is still reading the same rich condition. That is what is meant by switching, or in this case, not switching. The computer was expecting to see a change (switch) in a certain amount of time and that change did not happen. This is what is causing the P1152 in bank 2. This code isn't because it is running rich. It is because it isn't changing. So, before you do anything else, you need to find the sensor or the wires for your "missing" Bank 2 #2 sensor. For now, you should disconnect whatever is on it, clean off the ends and makes sure the wires are not damaged or broken. Tape it up and leave it disconnected. Disconnect the battery for a while to erase it's memory and see what it relearns. It will detect the sensor isn't there, which is fine. That is better than detecting bad information. |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
Yes that plug is lean it should have some soot
http://www.motorcycleforums.net/foru...gcondition.jpg |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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On it!!! :eek::cheers: Thank you!! There's some pinging now that I think about it, so I think you're right on all accounts! :eek: Quote:
Gotcha! Going out to look for the phantom O2 sensor now! |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
Can't find any wires or anything after the Bank 1 Sensor 2 (plugged into the cat and functioning properly).
Bank 2 sensor 2 is still reading 1.27v constantly. Where can I look in the wiring under the hood to maybe just snip those wires out completely?? |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
Here is me looking for the phantom O2 sensor...
http://youtu.be/dt8z2vstH2w ---------- According to absolutely everywhere, my 3.0 truck is only supposed to have 3 O2 sensors... :confused: |
Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
What engine do you have?
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Re: O2 Sensor / System too Rich Fault Codes, Seems to be running fine??
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