Causes
A P0032 DTC trouble code may be caused by one or more of the following:
- A short in the heater circuit in the sensor
- A failed O2 sensor heater
- Wiring/connectors broken/frayed leading to sensor and/or relay
- Failed PCM/ECM
Possible Solutions
To fix a P0032 DTC code, you'll need to do a proper diagnosis. To do that,
you'll want to inspect the wiring and connectors leading to the sensor. Also
if equipped with a heater relay and fuse, you'll want to check those as well.
Use a digital volt ohm meter to:
- check for 12 volts at the heater circuit feed (hint: unplug the sensor and
check at the wiring connector to do this measurement)
- check the ground circuit for continuity
- measure the resistance of the heater circuit (done on the sensor itself)
- measure the resistance and voltage of the wiring
Refer to a service manual for the correct specifications (volts, ohms) for
your vehicle. On some Toyota vehicles this code is triggered when the resistance
of the heater circuit is above 10 A.
With that said, a common fix for this DTC is to replace the air/fuel (O2 oxygen)
sensor #2 on bank 1.
Please keep in mind that OEM (original
equipment) replacement sensors are recommended
(from the
dealer). Aftermarket sensors can be less reliable and of poorer quality
(not always, but more often). There's also a chance that replacement parts for
the P0032 code may also fall under a federal emissions warranty (check with
your dealer to see if it's covered).
