O2 Sensor 2/2 Circuit High

P0140 - O2 SENSOR 2/2 CIRCUIT HIGH

P0140 - O2 Sensor 2/2 Circuit High:

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.

POSSIBLE CAUSES
- O2 sensor signal circuit short to voltage
- Engine exhaust leak
- O2 sensor
- Powertrain control module

DIAGNOSTIC TEST




1. CHECK FOR CURRENT DTC

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

Q: 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.
- Check for any Technical Service Bulletins that may apply.

Q: 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.