o2 sensor issue please help. - Subaru WRX Forum
 
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post #1 of 5 Old 06-20-2009, 05:47 PM Thread Starter
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o2 sensor issue please help.

Hey guys hows it going? I have not been on these forums in awhile but I have a problem and need your consulting. I live in Texas and am in a county that checks for emissions. Anyway, every year I just delete my codes with my AP, drive ~25 miles, and then take it in. For the past 2 years this has not been a problem until now. I did my usual inspection routine, deleted the codes and drove 25 miles (which always works!). SO...this time for some reason my 02 sensors keep displaying a "not ready" notice when I plug in for testing. Since I have NOT TOUCHED anything on the car in a year i.e. no new mods etc...do you guys think one of my o2 sensors just went bad? Its an 04 wrx btw with 60000 miles. In the past clearing the codes then going in after some driving has always worked. Please help me, i live hours away and cannot afford another trip back to houston (where she is registered) Iam really confused because it will throw the "catalyst" code indicative of cat failure, but don't the 02 sensors read this???? And...if my o2 sensors were ruined, wouldnt my car throw a CEL for that too? Im only getting the exhaust code yet its saying my 02's arent ready.

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post #2 of 5 Old 06-21-2009, 09:02 PM
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What are the codes that you keep "clearing?"
What modifications are there on the car?

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post #3 of 5 Old 06-23-2009, 10:34 AM Thread Starter
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p0420 catalyst below threshold..etc. The only one. Im running an 18g setup with a catless tubro back and other supporting mods. Usually the process above works to pass but I need to figure out what this "not ready" versus "ready" stuff means (regarding the emissions system). Anyone do inspections?

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post #4 of 5 Old 06-23-2009, 08:57 PM
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Sounds like your rear sensor died. Either that or you need a better tune.

I don't do emissions but the readiness monitors basically go to the ready status when you have driven far enough for all the sensors to gather enough information to give a good reading. OpenSource has a way of forcing them on, AP does not.

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post #5 of 5 Old 01-17-2010, 06:57 PM
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You are running catless mods? does that include o2 eliminators? the problem is the ecu needs to see a specific mount of variation between the front and rear o2 sensors to determine if the cat is working properly,if it doesnt the ecu usually blames the cat ,if there are no o2 codes.When a car comes in to the dealership with a 420...9 times out of 10 its a cat,even though the factory would have you test sensor ops and drop out parameters at fuel cut.
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