Re: 2000 echo check engine light
First off, you need to check the voltages going to the O2 sensor heater circuit. If you do not have the proper voltage then the ECU is probably bad (or the wrong one) or you have a problem in the wire harness to the sensor.
The next thing is to check the ground side of the circuit. That sensor has a connector behind the glove box that also goes to the ecu for the ground, or there may be a problem in the wire harness.
P0141 is for the REAR (behind the cat) sensor not the front one.
I hope you used a TOYOTA sensor not an aftermarket. The Toyota sensors are just as inexpensive as the aftermarket ones.
see attachments for help diagnosing.
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Last edited by mustang67408; 09-11-2008 at 09:49 AM.
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