P2270

DTC P2270: Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean

1. Reset the ECM/PCM.
2. Start the engine. Hold the engine at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
3. Test-drive under these conditions:
- Engine coolant temperature more than 176 °F (80 °C)
- Vehicle speed between 35 mph (56 km/h) and 55 mph (88 km/h)
- Drive 1 minute or more

4. Check for Temporary DTCs or DTCs with the HDS or a scan tool.

Are any Temporary DTCs or DTCs indicated?

YES - Replace the secondary HO2S (Sensor 2).

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and at the ECM/PCM.