Our cars have two 02 sensors. The front and the rear. You should be able to use the rear with most any A/F ratio guage.
that's cause they are plugs are prolly different but on MY00-02's we have wideband front O2'sHOK said:someone told me MY99 O2 sensors front and rear are the same narrrow band O2....
Hooking it to the rear O2 would have you monitoring the Catalyst output, which will give some indication of the engine's A/F ratio, but not as good as an O2 sensor before the cat. Also, it is a bad idea to splice into the factory wiring, as any voltage spikes, etc that may possibly be generated in the A/F gauge will feed right to the ECU and could destroy it. They are quite sensitive to that kind of thing, that's why you only use high-impedence DVOMs on ECU wiring and not a gauge type volt-ohm meter.Hndatch627 said:OBD-II the first is the O2 sensor and the second is that catalyst effiency monitor.
and you can't hook it to the front O2 but you can hook it to the rear O2.
yes this is the correct way to do it. As far as the damage goes...i have seen many done with NO problems...Autometers guages are 100% electronic and i have YET to see any single one cause an ECM/PCM failure. I plan on having a second bung added to the Downpipe once the turbo goes on so that i can guarantee a rich mixture. Andi do agree it's bad to splice into a factory harness but it happens all the time. As for voltage spikes, there is a built in limit, just look at everyone going turbo. They have at one time or another sent a nice spike thru the ECM/PCM.Skidd said:So the best thing to do would be to weld another bung into the pipe near the front o2 sensor, and use a dedicated o2 for the AF gauge? Correct?
there are none, because they all use a standalone sensorcan anyone recommend a wide band that you wouldn't have to weld on a new bung
by new bung do you mean one completely separate from the original front one or can you weld a new bung in place of the original o2 sensors placeWow, an 11(almost 12)-year bump! That might be a record!
There aren't any widebands that don't require a new bung to operate properly. That said, Skidd has since created a little Java app that can read the stock front O2. You just need a certain kind of OBDII adapter.
You haven't met George of the Jungle yet.Wow, an 11(almost 12)-year bump! That might be a record!
shhhhh if he sees I've bumped an old thread he may start to haunt my old threads lol like 2 years oldYou haven't met George of the Jungle yet.
most if not all widebands come with the bung, they drill a hole, weld, done. On turbo cars this goes in the downpipe.by new bung do you mean one completely separate from the original front one or can you weld a new bung in place of the original o2 sensors place
and yea old bump I had a question might as well pick an oldie to bump instead of make my own thread
I don't have a tig welderthere are none, because they all use a standalone sensor
why is welding a bung such an issue? Literally takes 5 minutes to do, and anyone with a TIG can do it (even cheesy exhaust shops have this)
Negative. Some older Scoobs have a narrowband, but they have been using a WideBand for years now. my 2000 has a wideband. Not sure about the 1999 or prior though. To my knowledge, everything Subaru made after at least 2000 uses a wideband front o2 sensor.Note: Front stock sensor is a narrowband, and doesn't read real well outside of 14.7 (if you were reading the original thread)
I should have refreshed my page before I postedNote: Front stock sensor is a narrowband, and doesn't read real well outside of 14.7 (if you were reading the original thread)
You *might* be able to find a wideband that uses the stock thread dia and pitch, and replace the stock front sensor. I know several wideband gauges have an analog 0-5v output that if you scale it just right can *work* to simulate the stock narrowband signal.
This being said, you'd save a lot of time and headache just having a bung welded in. Seriously, it'll cost you $10 to have an exhaust shop weld one in.