O2 sensor location
You didnt say what eng you have, but all have 4 O2's sensors, 2 upstreams, 2 down streams, left side up is 1/1,left side dwn is 2/1, right side up is 1/2, right side dwn is 2/2, on the exhaust system, always 2 sensor before the cats and 2 after the cats, depending on fuse, 5 v supply to sensors or 12v to the heater part of sensor, you have a short to ground in the harness of one sensor, check all harness and wiring, or a internal short in one sensor, there is also a relay that cotrolls the o2 sensors, swap it out, if you need more info, just ask. GOOD LUCK, RDJRP
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