Component Inspection

Engine Control
P2271 HO2S Signal Stuck Rich (Bank 1 / Sensor 2) - Component Inspection

Component Inspection

1. Visually/physically inspect the air leakage in exhaust system
2. Visually/physically inspect the TWC and HO2S(B1/S2) for contamination, deterioration, or damage.
3. Was a problem found in any of the above areas?
YES
> Replace or repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
> Go to next step as below
4. Warm up the engine to normal operating temperature and check that HO2S signal is active.
5. Connect Scantool and monitor the "O2 SNSR VOLT.(B1/S2)" parameter on the Scantool data list.
Test Condition : Ignition "ON" & Engine "ON" & In Idle("Closed Loop")condition




6. Is sensor data near the specified value?
YES
> Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
> Check HO2S(B1/S2) for contamination, deterioration, or damage. Substitute with a known-good HO2S(B1/S2) and check for proper operation. If the problem is corrected, replace HO2S(B1/S2) and then go to "Verification of Vehicle Repair" procedure