scubthebub Posted January 29, 2006 Report Share Posted January 29, 2006 so i replaced my plugs, wires, cap, and rotor and then checked my error codes and got:Powertrain P0131 HO2S Circuit Low Voltage Bank 1 Sensor 1so i hooked up my car to my laptop and got this for the votage reading (lower Left graph) it is a 90 second history with about a reading a second.If I recall Correctly it should be a constant 1 volt after warming up, just wanted to make sure before i spend $200 Link to comment Share on other sites More sharing options...
scubthebub Posted January 30, 2006 Author Report Share Posted January 30, 2006 bump Link to comment Share on other sites More sharing options...
prasamin Posted January 30, 2006 Report Share Posted January 30, 2006 no, as far as I remember, the voltage on the O2 actually fluctuates, which indicates that it is functioning. I hope someone can verify this...i hooked my car up to an expensive tool, and saw the front and rear fluctuations myself....don't know if that's what you're referring to. Link to comment Share on other sites More sharing options...
scubthebub Posted January 30, 2006 Author Report Share Posted January 30, 2006 no, as far as I remember, the voltage on the O2 actually fluctuates, which indicates that it is functioning. I hope someone can verify this...i hooked my car up to an expensive tool, and saw the front and rear fluctuations myself....don't know if that's what you're referring to.yea, that's what i'm wondering. I could run the two O2's at once, but i'm not 100% sure my rear is good either. Link to comment Share on other sites More sharing options...
scubthebub Posted January 30, 2006 Author Report Share Posted January 30, 2006 bump, anyone else? Link to comment Share on other sites More sharing options...
Asinine Posted January 30, 2006 Report Share Posted January 30, 2006 Do you have a check engine light. I know on my '97 even before my O2s were 'officially' toast i would get CELs on a single fault over a few weeks! Link to comment Share on other sites More sharing options...
scubthebub Posted January 31, 2006 Author Report Share Posted January 31, 2006 Do you have a check engine light. I know on my '97 even before my O2s were 'officially' toast i would get CELs on a single fault over a few weeks!Yea, i've got a CEL and it runs a little rough at idle. Error code:P0131 - HO2S Circuit Low Voltage Bank 1 Sensor 1 Link to comment Share on other sites More sharing options...
MadeInJapan Posted January 31, 2006 Report Share Posted January 31, 2006 That code is usually a sign of a bad front 02 sensor. Link to comment Share on other sites More sharing options...
prasamin Posted January 31, 2006 Report Share Posted January 31, 2006 is it an OEM sensor and is it installed in the stock location? Link to comment Share on other sites More sharing options...
viperman135 Posted January 31, 2006 Report Share Posted January 31, 2006 If I recall Correctly it should be a constant 1 volt after warming up, just wanted to make sure before i spend $200Wish I could help you with your problem. Just to let you know front o2s are $170 at FCP. Link to comment Share on other sites More sharing options...
scubthebub Posted January 31, 2006 Author Report Share Posted January 31, 2006 That code is usually a sign of a bad front 02 sensor.that's what i figuredThat code is usually a sign of a bad front 02 sensor.yes, and yesA new sensor it is, i'll have to check what a good voltage should be to see the difference. Link to comment Share on other sites More sharing options...
Gioseppe Posted January 31, 2006 Report Share Posted January 31, 2006 a front o2 sensor should fluctuate between ~200mv to ~700mv back and forth.if it stays in one spot ~400mv, it means that it is dead and is putting the car into limp mode.it should be taking readings multiple times per second, not once per second.if you need to get a new o2 sensor, i can offer bosch(oem) for quite cheaper then even fcp, just pm me.no, as far as I remember, the voltage on the O2 actually fluctuates, which indicates that it is functioning.precisely Link to comment Share on other sites More sharing options...
Sinbad Posted January 31, 2006 Report Share Posted January 31, 2006 Have you checked for boost/vacuum leaks?The O2 sensor looks reasonable - correct it should fluctuate at idle. However, it can throw codes if the fuel mixture is consistently wrong (leak, or maf) Link to comment Share on other sites More sharing options...
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