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Old 02-25-2006, 03:09 PM   #1
Lachlan
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Member#: 19470
Join Date: May 2002
Chapter/Region: SWIC
Location: albuquerque, NM
Vehicle:
1981 Brat GL
Blue

Default Oxygen sensor in EJ20K

I know in the 02 WRX there were two oxygen sensors; one front on 5V that was used for measuring the A/F ratio for the ECU (wideband?) and one rear on 1V that was for cat efficiency that was the one folks usually hooked up aftermarket A/F meters to. Does the EJ20K have one or two? There's one in the downpipe which seems to be a 5V jobber. I assume that is the one the ECU uses for A/F ratios, and there is no 1V "rear" sensor?
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Old 02-25-2006, 05:12 PM   #2
Scoobie Steve
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Join Date: Sep 2000
Chapter/Region: Tri-State
Location: Bangor, PA
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1998 11.87@112mph
Subaru L Ver 6 STi Type R

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Multiple O2 sensors are for emmisions. JDM engines use 1 O2 sensor and its a 0-1v
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Old 02-25-2006, 05:23 PM   #3
Lachlan
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Mine's definitely showing more than 1v
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Old 02-25-2006, 10:43 PM   #4
linsavy
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1997 GF4-STiV3 clone

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Mine is a wideband too.
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Old 02-25-2006, 11:30 PM   #5
Scoobie Steve
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Subaru L Ver 6 STi Type R

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What?? lol count the wires on your sensor, you need five for a wideband. Up to Ver 6 is NOT wideband, after that I dont know or care
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Old 02-26-2006, 12:08 AM   #6
Lachlan
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Location: albuquerque, NM
Vehicle:
1981 Brat GL
Blue

Default

3 wires; 1 ground, 1 12V, 1 signal. I don't know if it's a wideband or not, but I can tell you I've seen it at 2.5V at idle.
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