OK, just got the check engine codes for my wifes 86 Rodeo, 4x4 with the V6.


PO144 O2 Sensor Circuit High Volts Bank1 Sensor 3


PO155 O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 1


PO304 Cylinder 4 misfire detected


OK, now which side is bank1?? and I crawled under the car and found 1 sensor on each pipe coming from the manifold and 1 on the "Y" connector just before the catalytic converter, is this the sensor #3 mentioned in the PO144 code??


The last code doesn't surprise me as it has been some time since it was last tuned up according to the PO records we have...


How can I fix the PO155 code???