O2 Sensor 2/2 Circuit High

P0140 - O2 SENSOR 2/2 CIRCUIT HIGH





When Monitored and Set Condition

- When Monitored: With the engine running between 1000 and 2000 RPM, engine load between 15% to 50%, closed loop mode, the three way catalytic converter temperature is greater than 380° C (716° F), and the O2 sensor heater must be ON for at least 220 seconds to enable the signal inactive portion of the test.
- Set Condition: The high limit: O2 Sensor voltage is greater than 1.5 volts for approximately 5 seconds.







Diagnostic Test

1. CHECK FOR CURRENT DTC





Turn the ignition on.

With the DRB III(R), read PCM DTCs.

Is this DTC present?

Yes

- For complete diagnosis of this DTC, refer to (P0131) O2 SENSOR 1/1 CIRCUIT LOW. P0131

No

- Go To 2

2. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

NOTE: Check connectors - Clean/repair as necessary. Poor pin to terminal connections can set DTCs.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors specific to this DTC. Wiggle the wires while checking for shorts and open circuits.

NOTE: Check for any Technical Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform POWERTRAIN VERIFICATION TEST - VER 2. Powertrain Verification Test - Ver 2

No

- The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.