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99 explorer cat question

Discussion in 'Stock 1995 - 2001 Explorers' started by shanes76, July 2, 2011.

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    1. shanes76

      shanes76 Active Member

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      I have a question about my cat converter. My check engine light is on and I had it scanned and it comes back to both O2 sensors, 1 is burning rich and 1 is burning lean, could my converter be causing this? If I cut it off and weld a striaght pipe in place will it interfer with my O2 sensors?
       
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    3. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      rich & lean

      It is unusual to have one bank excessively rich and the other excessively lean. Did you happen to disconnect and reconnect the pre-cat O2 sensors before the Check Engine started illuminating? If so, you may have erroneously (left to right & right to left) reconnected them.
       
    4. shanes76

      shanes76 Active Member

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      it was like that when I bought it and I had it scanned at autozone and tats what it came up, so I just change them around? Will it hurt anything removing my converter?
       
    5. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      O2 heaters

      The O2 sensors have a heater that is monitored by the PCM. You can disconnect the easiest one to access (usually the precat one on the driver side) and see if you get a heater fault for bank 1 (passenger side) or bank 2 (driver side). I wouldn't just switch them around unless you determine they are connected wrong.
       
    6. shanes76

      shanes76 Active Member

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      well I had autozone check my codes this morning and the O2 sensors didnt show up, now its saying a vacum leak in the EVAP system, my egr solenoid wasnt working so I put a new on and unhooked the battery then hooked it back up and the light stayed off until I got on the highway and it came back on but I havent had it scanned again yet.
       

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