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Old 09-09-2003, 10:17 PM   #1
EddyRS
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Member#: 1257
Join Date: Apr 2000
Location: In the Valley.....Somewhere...
Vehicle:
2000 GC8 WRX
93 RS-W Wagon (White) RIP

Default P0130 O2 Circuit Malfunction

Hello All,

I am have a fun time trying to solve an issue I have with my 2.5L converted Wagon.

I keep getting a P0130 CEL, which says that it is a O2 Circuit Malfunction. I have changed the O2 Sensor with no fix.

There is no noticable adverse effect on the performance of the car, it just keeps throwing the CEL.

Here's where it gets confusing.......I plugged in my OBD-II Scanner and monitored the O2 Sensor. While running with load (i.e. the car in motion with constant throttle usage)...I get an average reading of between .922 to .978 Volts.....while the car is running at idle it sits right at .955 volts. BUT whenever I lift off the throttle and induce "Engine Brake" the reading goes right to .0000 Volts or zero (This is with the car in motion....Also when I mean "Engine Brake"...I am refering to whenever you let the compression of the engine slow the car.....or whenever you lift off the throttle to shift). Also If I am fast enough in the shift, the voltage will not drop completely to zero.....and will quickly return to the .955 volt region.

I have talked to some Subaru Techs and they say that of course this is not right. But they also said that without looking at the car themselves (I.e. Costly troubleshooting) that they do not know what it may be. I was told to check the Alternator, and the battery....but as there is no adverse effect....i.e. the battery is getting charged.....and no other electrical component seems effected.....including how the engine runs....I cannot see it being either the alt or the bat.

Here's where you guys come in......for those who may have experienced something simular.....what may be causing this weird action.

Throw out the ideas......PLEASE


THANKS

EddyL.
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Old 09-09-2003, 10:25 PM   #2
codger
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I had (and still have) the same problem, discussed here

I used to get a P-0130, (O2 Sensor Circuit Malfunction, Bank 1, Sensor 1), after about 10 minutes of driving. Put in a new front sensor last week. Now I get a P-0031 (Front oxygen sensor heater circuit low input) immediately. Also go into open loop straight away. Not sure if I got the right part, or maybe is there a problem with the harness connector damaged from too much snow and mud driving

Jim
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Old 09-09-2003, 11:02 PM   #3
EddyRS
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93 RS-W Wagon (White) RIP

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That sounds like it........It will throw a CEL after about 10 min when cold......when the engine warms up it will come on almost immediately.

Yea....it looks like you may have gotten another bad/wrong unit. You may want to change it back and take the one back. I take it that the original one only threw the CEL, but did not cause the car to go into LIMP mode....right ?

Thanks

Ed
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Old 09-09-2003, 11:47 PM   #4
codger
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Well, I just went out to the garage, and fiddled around and wiggled the connection from the front O2 sensor to it's clip-in-wiring-socket. And the CEL is gone - even after warm up

I bet the first unit went bad to start with, and the new one was not plugged in firmly enough, or else there's an almost broken/loose wire somewhere at the clip in location.

I'll take an extra long drive to work (more than the usual 10 minutes) to make sure the problem is solved.

Jim
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Old 09-10-2003, 09:02 PM   #5
munkis
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your using the ecu and o2 sensors from the 2.5L out of yoru 00 rs correct?

if you still have a problem make sure you are using the vin# from your RS to get the o2 sensor.

Jay
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Old 09-22-2003, 08:14 AM   #6
codger
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Well, CEL didn't totally go away, it just changed. I was getting the P-1137 instead after about 15-20 minutes of driving. So wiggling the connection changed the sensor that much. I thought either a broken harness wire, or else a dirty connection. Sprayed the junction with elecronic cleaner, reseated it. All is good for now.
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