HO2S 1 CIRCUIT HIGH VOLTAGE
PCM provides about 0.45 volt reference to HO2S 1. HO2S 1
sensor signal voltage varies from about one volt when exhaust is rich
to about 0.1 volt when exhaust is lean. PCM reads and stores sensor
voltage information and evaluates the voltage samples to determine
amount of time sensor voltage is out of range. If HO2S 1 voltage is
out of predetermined range, DTC will set.
You will likely not notice any drivability problems.
- The oxygen sensor heater circuit is shorted out
- The wiring to the sensor is damaged.
The simplest thing to do is to reset the code and see if it comes back.