DTC P2270, P2272

DTC P2270  : Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean

DTC P2272  : Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System .
• Information marked with an asterisk (*) applies to the front bank (Bank 2).

DTC (PGM-FI)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Start the engine.

   - 4. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

   - 5. Test-drive under these conditions:

   • Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
   • Transmission in D
   • Engine speed between 1, 500-3, 000 rpm
   • Drive 35 seconds or more

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1
   ENGINE SPEED

   - 6. Monitor the OBD STATUS for DTC P2270 and/or P2272 * in the DTCs MENU with the HDS.

   DTC Description	OBD Status
   P2270 Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean
   P2272 Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean

   Does the HDS indicate FAILED?

   YES 

   Replace secondary HO2S (Sensor 2) .

   NO 

   If the HDS indicates PASSED, intermittent failure, the system is OK at this time.

   Check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM.

   If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System .

   If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 1-3 and recheck.