obd code p0141

O2 sensor forward of Catalitic Converter preheat. Replaced sensor. 12V at connector for heater, however no bias voltage at connector(analog meter). Wiring? PCM? DCS

P0141 = O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) / after cat sensor. Sounds like you are on the right track. I dunno at what point the 12v circuit to the o2 sensor(s) heater goes live, but I would suspect a dead sensor, broken wire or corroded connector. G/luck
Joel

My '96 Rodeo 3.2 just failed it's emissions test with the same p0141 error code. Is it easy to replace this sensor? Any instructions?

Also my check engine light isn't working. I don't even know where to begin on that one.

TIA!