O2 SENSOR TEST.

This video will show you how to diagnose the o2 sensor circuit before replacing your 02 sensors ( oxygen sensor ) if you scan and have these 3 codes at the same time test the circuit first as seen in video. This test can be done in abt 1 minute.

O2 SENSOR CKT codes.

PO135 o2 sensor heater circuit Bank 1 Sensor 1

PO155 o2 sensor heater circuit Bank 2 Sensor 1

po498 evap vent sol ckt.

The best way to test the o2 sensor fuses is with the test light.

The test light can be purchased at any parts store for abt $20 bought mine at sears.

If the fuses are good and you have the check engine codes for the o2 sensors ( oxygen sensor ) test the ckt according to the wiring diagram and if ckt is good test the o2 sensors see my o2 sensor test video.