Check HO2S (B1/S1) Heater resistance

WARNING: This page is about a different variant/trim than selected.

IG "OFF". Disconnect HO2S (B1/S1) connector.
Measure resistance between power and control terminals of HO2S (B1/S1) heater (Component Side)
Specification: 2.4 ~ 4.0Ω [20°C (68°F)]
Is the measured resistance within specification?
YES
- Substitute with a known - good ECM and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Substitute with a known - good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.