P1157 - Lack Of Ho2S-22 Switch, Sensor Indicates Lean
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P1157 - LACK OF HO2S-22 SWITCH, SENSOR INDICATES LEAN
| 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 |
| Dedicated NGV | - | GO to HA: Natural Gas Fuel Control STEP 30 | - |
| All others | - | GO to H: Fuel Control STEP 58 | - |