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Found 5 results

  1. Additional info required: A while ago (like a year or more) there were some threads floating around about O2 sensor voltage readings in the 3+ volt range on diagnostic scanners. I don't recall there being a clear answer as to the reason at the time. I have had some O2 sensor issues recently so I went digging for info and basically found that the reason for the trouble was that I bought the wrong type of sensor. I bought an O2 sensor, when what I needed was an Air/Fuel Ratio sensor. The problem was on a Toyota, but the same principles of how the sensors differ apply to every brand of vehicle. The link below comes from a website we use in school, and has tons more info about various sensors and their functions, as well as dozens of other tech articles that can be useful during diagnosis of a problem. What my issue boiled down to is the ECU was getting a reading of incredibly lean mixture from the O2 sensor. Because on an O2 sensor rich = high voltage and lean = low voltage. but wih an A/FR sensor its the opposite, rich = low and lean =high. The ECU would add more fuel and get a rich voltage back rom the sensor,except the ECU is programmed to read high voltage as lean, even though the sensor was responding as it should. And so the cycle repeats itself until the ECU can no longer adjust, which in this case pegged the Long Term Fuel Trim at 44.5%. But back to the point, if you get oxygen sensor voltage reading in the 3V range on a scanner, its because you have an Air/Fuel Ratio sensor, which gets supplied a reference voltage of 3.3V from the ECU. The sensor then bumps up (if lean) or bumps down (if rich) the return voltage signal back to the ECU. Some ECUs convert scanner output to a normal O2 sensor output voltage to avoid confusion, but not all. Be sure of what you have before purchasing a replacement sensor. http://www.autoshop101.com/forms/h37.pdf
  2. I just bought a used 1998 Legacy 2.2 5spd MT with ~169,000 miles on it. I'm looking for replacement knock and downstream O2 sensors for it. For the O2 Sensor, I am looking at the Bosch 15726. Is this a good sensor or should I go with the more expensive OEM part? For the knock sensor, I have not yet found a suitable part. Are there any non-OE parts or should I stick with OEM?
  3. Hey everyone, I just bought my first subaru a few weeks ago. Its a 99 legacy sedan L sedan. So far I like the car, I think I lucked out getting a 99 since its the base model but I still have the sunroof/spoiler/alloy wheels combo. Its a 5 speed standard too which is fun since I spent the winter in an automatic jeep cherokee. I paid $800 for the car which has 155,000 miles on it. When I bought the car the man who owned it told me the check engine light was on for a front 02 sensor. When I had the codes checked it turned out it had codes for front 02 as well as a knock sensor. I replaced the knock sensor and it seems to be running more smoothly already. My main question and motivation for posting this thread is this: When I jacked the car up to change the oxygen sensor, the source of my exhaust leak became obvious. I have a fairly significant leak coming from where the header meets the manifold. It looks like the flange is pretty well rusted out. Is it possible that this leak before the 02 sensor could be causing the code? I was thinking of replacing the sensor to see if it would clear the light, but I feel like that might be a waste of time since the leak might be the reason for the code. I was thinking of ordering a replacement header, which runs about 140 bucks from advance auto in town, but they'd have to order it anyway so I'm looking around a bit for better prices. Should I replace the header & o2? or just one or the other?
  4. I bought this Subaru about 2 weeks ago for a couple hundred bucks on a rainy dark night. Ran, shifted, and stopped just fine. Bought it and drove it around until i had to registar it. Then i started poking around. To the point: Can somebody provide me with a picture of the o2 sensor plug/location? I have been tracing wires on and off for a while and cant seem to find where the o2 sensor connects into the harness. The wires coming off of the sensor itself have definitely been cut off, but i wouldnt this they would have cut the harness as well... Im starting to wonder if the previous owner chopped it off when they swapped in a new engine. (Still an ea82 Spfi) Much appreciated.
  5. Okay so here is my question, I have a 2001 Lego 5 speed with 125,xxx miles on her, and Is there any difference between O2 sensors for the automatic and manual? On Subaru Parts For You it lists that there are two different O2 sensors as seen here: http://subarupartsforyou.com/cp_partlistbymod.php?model=Legacy&subcat=Sensor%2C+Oxygen&year=2001 I just wanted to know of this was true or not because my car has the dreaded P0420 code and I have done everything to get if off such as running NGK spark plugs, OEM Beck Arnely wires, OEM coil pack when the original one went bad, new air filter, fuel filter, intake gaskets, head gaskets, and I already did a timing belt kit on it when it hit that interval including thermostat (used the proper one, not the ordinary one) water pump, and I'm running good 89 octane gas threw her. So the only thing left is to change the front O2 sensor and I have a used one that was good out of a 2000 outback but it was an automatic so I'm not sure if they would interchange. I'm going to try the seafoam trick tomorrow to see what that does. My New York state inspection is up in a couple of months and it needs to pass the OBII check being 1996 and newer...good ol' NYS!!!
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