HO2S Heater Resistance Inspection

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Perform the following test only when directed.

Disconnect the HO2S connector.
Measure the resistance between HO2S terminals C and D using an ohmmeter.
- If not as specified, replace the HO2S.
- If HO2S heater is okay, but PID value is out of specification, perform the CIRCUIT OPEN/SHORT INSPECTION .
Fig 1: Identifying HO2S Part Side Connector
Courtesy of MAZDA MOTORS CORP.

HO2S heater resistance
1. Front: 2-20 ohms
2. Rear: 2-50 ohms
Reconnect the HO2S connector.