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Discussion Starter · #1 ·
Hello, I am new to this forum and Subarus meaning that this is my first Subaru and first post. Thanks for all the great information. I currently have a P0420 code and am trying to determine the issue. I have a 2013 Outback with 121k miles which I bought back in March 2017. There were lean codes which were due to some oil leaks so I had the engine reseal done by the dealer (Ouch!) but I bought it at a reasonable price and knew there would be some gotchas due to mileage etc. I also had a tuneup (plugs, pcv, air filter, oil change, changed coolant etc). I now intermittently get a P0420 code. I am trying to upload a video of what I am seeing when I hook up my code reader but am not having much luck so I will add what I am seeing below. The car is warmed up and idling. Here are some of the readings over a period of 5 or so minutes. The ETC ranges between 192 - 194 F (even when I am revving it to 2500 RPMs). I am not sure what the AF sensor voltage should be reading but I read somewhere it should be about 2.44 V for subies, with my AF sensor ranging from 2.183 - 2.197 V (stuck AF sensor) it makes me wonder if it is running rich slightly based on the ETC maintaining 192 - 194 F and not going higher most of the time (thermostat)? This is just a wild guess on my part from the tutorial in the post. Upon initially checking the battery the water level was low so I added some distilled water, gave it a charge and have had no problems at all with it. Not sure if this could be an issue.

ETC (192 - 194 F),
LOAD_PCT 21%,
SHRTFT1 -0.8 - 0%,
LONGFT1 -0.8 - 0%,
MAP 12.1 inHg,
RPM 793,
MAF 0.497 - 0.545 lb/min
SPARKADV 15,
IAT (118 F),
02B1S2 0.68 - 0.78 V
SHRTFTB1S2 0%
02B1S1 2.183 - 2.197 V
CATEMP11 690.26 F

Thanks in advance
 

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2013 Outback 2.5i Limited w/moonroof package and Illumination Package #2 Dark Grey Metallic
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67 Posts
What was your solution to the p0420 code?
 

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2010 Outback 3.6R 2014 Legacy 2.5i
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3,086 Posts
there are several solutions

1. fix the rich fueling condition (leaky injectors, faulty plugs, bad coils)
2. fix any air leaks
3. verify proper operation of rear o2 sensors
4. if none of the above, new CAT
 
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