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Old 01-11-2012, 05:19 PM   #1
TheGremlyn
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Default 2011 WRX AFR Reading - What kind of sensor?

I have been trying various searches to see what information I can find on this topic, but am coming up empty. I have the PLX Devices Kiwi BT that allows me to read various sensors from the ECU (and log them). One of those readings is Measured AFR (given in an actual air-to-fuel ratio, of course it sits around 14.7:1 at idle). I am curious is this is a narrowband reading or actually a wideband?

Looking at the Subaru replacement parts list, there is not only an O2 Sensor, but a specifically listed air/fuel ratio sensor. This makes me think the car has a wideband sensor included from the factory. Am I right?
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Old 01-11-2012, 05:24 PM   #2
dux10
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despite its name, it is still a narrowband sensor and highly inaccurate below 13.5:1 (maybe even below 14:1). i believe its lowest reading is 11.25 but again- that reading is HIGHLY inaccurate.
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Old 01-11-2012, 06:22 PM   #3
TheGremlyn
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Damn... you wouldn't expect a narrowband to cost so much to replace ($200 msrp from Subaru).
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Old 03-12-2012, 08:57 AM   #4
Odyknuck
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Quote:
Originally Posted by dux10 View Post
despite its name, it is still a narrowband sensor and highly inaccurate below 13.5:1 (maybe even below 14:1). i believe its lowest reading is 11.25 but again- that reading is HIGHLY inaccurate.

Hmm! I was under the impression that the 5 wire AFR sensor was a medium band and fairly acurate.
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