idosubaru Posted April 7, 2008 Share Posted April 7, 2008 Baffled: 1997 Impreza O2 sensor: 22690AA220 1997 Legacy O2 sensor: Front: 22690AA290 Rear: 22690AA220 I'm confused in a number of ways. First, does the Impreza only have one O2 sensor? And is the Impreza front sensor the same part number as the rear Legacy sensor? Link to comment Share on other sites More sharing options...
johnceggleston Posted April 7, 2008 Share Posted April 7, 2008 Baffled: 1997 Impreza O2 sensor: 22690AA220 1997 Legacy O2 sensor: Front: 22690AA290 Rear: 22690AA220 I'm confused in a number of ways. First, does the Impreza only have one O2 sensor? And is the Impreza front sensor the same part number as the rear Legacy sensor? advance auto has them the same for these years, not that i'd buy one from advance: Bosch Oxygen Sensor: Part Number: 13702 This product fits the following vehicles - click on a vehicle to see detailed engine information. SUBARU back to top 1998 - 1999 FORESTER 1996 - 1999 LEGACY 1998 - 1999 IMPREZA Link to comment Share on other sites More sharing options...
idosubaru Posted April 7, 2008 Author Share Posted April 7, 2008 WHAT?!?! i'm totally confused. In 1995 the Legacy EJ22 has the same O2 sensors front and back: 22690AA220 But the 1995 Impreza EJ22 has different O2 sensors listed front and back: 22690AA220 FRONT 22690AA640 REAR I know that people swap these motors all the time...including ECU's and such. So if you're running a 95 ECU in a swapped car...which do you go with? It's also odd that 97 Imp EJ22 front O2's are the same part numbers as 97 Legacy rear O2's...and there was no EJ22/EJ25 legacy distinction. Link to comment Share on other sites More sharing options...
johnceggleston Posted April 7, 2008 Share Posted April 7, 2008 i think the difference in the o2s for legacy, front and rear late 90s, is the connector. i think the sensor is the same. IIRC the 2 i compared were both denso /bosch wit hthe same number stamped on them, but the connectors were different, i think. it does not surprise me that the impreza changed before legacy, example: impreza went to a the phase 2 auto trans before legacy, a year at least. then in 00 or 01, the 2,2L impreza and legacy went with the same trans, same part number. then they discontinued the 2.2 altogether. it's just my guess, but i think they shared a trans for a while before phase 2, they just had different part numbers (maybe different final drives?). like the 96 outback trans has a different part number from the 97 outback, but the only difference is the production date. your question about swapped engines and not-swapped o2s brings up a good point, but i think the o2s stay with the car. the ecus generally stay with the car. it just doesn't seem too critical about the o2s. maybe that's why you can buy generic o2s, even if they aren't as reliable as oem. so to answer you question, you go with the sensor that fits the wiring and WORKS. hopefully you have several to choose from. Link to comment Share on other sites More sharing options...
idosubaru Posted April 7, 2008 Author Share Posted April 7, 2008 OH MY! you just made this even more confusing. i didn't even consider that. if the wiring is different...then how do people get away with swapping 95 EJ22's into later models but retaining the later models different O2 sensors and later model wiring? i suppose the answer is simple and the ECU sees only what it needs to but man that seems like unnecessary complication. Link to comment Share on other sites More sharing options...
idosubaru Posted April 10, 2008 Author Share Posted April 10, 2008 i think the difference in the o2s for legacy, front and rear late 90s, is the connector. good job JCE!!! I checked with the local dealer and sure enough the connectors are different. so for most simple EJ swaps you want to match the O2 to the vehicle - not the ECU. good to know - nice job JCE. Subaru shows different part numbers for 95 EJ22 and 96 EJ25 front O2 sensors. the 1995 Legacy EJ22 - 22690AA220 the 1996 Legacy EJ25 - 22690AA290 Auto parts stores show the same universal part number for both years. Link to comment Share on other sites More sharing options...
crazyhorse001 Posted April 11, 2008 Share Posted April 11, 2008 Gary, I had to swap my fron O2 sensor when I swapped motors. The plug is different on the 2.2 sensor. That's the one & only difference I could SEE. Oh & running w/o a front O2 sensor is a BIG no-no. You'll get the flashing CEL of death. Not that I'd know from experience or anything. :-p Link to comment Share on other sites More sharing options...
idosubaru Posted April 11, 2008 Author Share Posted April 11, 2008 Gary, I had to swap my fron O2 sensor when I swapped motors. The plug is different on the 2.2 sensor. i didn't have to swap O2 sensors when i did an EJ25 - EJ18/22 swap. OH - i know why.....i used a 97 EJ22 and you used a 95 EJ22....so the plugs different, i get it! the 95's were a one year plug...goofball subaru's! Link to comment Share on other sites More sharing options...
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