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O2 Sensor Heater Trouble

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10-20-2005, 06:39 PM

rkaufman311 rkaufman311 is offline

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O2 Sensor Heater Trouble

My 2000 Cherokee is throwing trouble codes for all four O2 sensor heater circuits. Is it possible that all four O2 sensors are bad? Could both relays be bad? No sensor codes, only heater circuit. Looks like a bad ground to me but I can't find where the heaters pick up common chassis ground. Does anyone have a good scematic?

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