h28: HEGO Sensor Check
| Steps | _Key Off
_HEGO sensor disconnected _Connect DVOM to HEGO Signal at the HEGO sensor connector and to battery negative post _DVOM on 20 volt scale _Create a vacuum leak to cause HEGO sensor to go lean For 1.9L and 2.3L TC: Disconnect the manifold vacuum hose For 5.0L SEFI Mass Air: Disconnect any vacuum hose from the manifold vacuum tree For all other applications: Disconnect the PCV valve hose from the PCV valve _Start engine and run at approximately 2000 RPM. |
| Result | Does the DVOM indicate less than 0.4 volts within 30 seconds? |
| Direction | YES
Reconnect HEGO sensor and vacuum lines. HEGO sensor is OK. GO to Continue NO Reconnect vacuum hoses. Replace HEGO sensor. Rerun Quick Test |
| Component | Heated Exhaust Gas Oxygen Sensor |
| Description | The HEGO sensor supplies the EEC with a signal that indicates a rich or lean condition during engine operation. |
| Location | Threaded into the turbo outlet elbow |
| Wire Colors | Dark Green with Purple stripe
Grey with Yellow stripe Black with Light Green stripe |
| Image |   "> |