P1138 - Lack Of Ho2S-12 Switch, Sensor Indicates Rich
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P1138 - LACK OF HO2S-12 SWITCH, SENSOR INDICATES RICH
| Description: | The downstream HO2Ss are forced rich and lean and monitored by the PCM. The test fails if the PCM does not detect the output of the HO2S in a calibrated amount of time. | ||
| Possible Causes: |
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| Diagnostic Aids: | - | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | - | GO to H: Fuel Control STEP 58 | - |