DTC P2270: Lack Of Ho2S-12 Switch, Sensor Indicates Lean
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P2270 - LACK OF HO2S-12 SWITCH, SENSOR INDICATES LEAN
| Description: | The downstream heated oxygen sensor (HO2S) is forced rich and lean and monitored by the powertrain control module (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 Pinpoint Test H . | ||