OBD code P0140 indicates a fault with the Rear Heated Oxygen Sensor Bank 1 in the exhaust system.
Symptoms include the Engine Light ON, high fuel consumption, and excessive exhaust smoke.
Causes can be a faulty sensor, wiring issues, fuel pressure problems, or intake/exhaust leaks.
This issue should be addressed promptly to prevent further damage.
A possible fix involves inspecting and repairing the sensor, wiring, and related components.
| Repair Importance Level | 6.67 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
Symptoms of the p0140 OBD Code
The vehicle may experience issues related to the oxygen sensor circuit malfunction indicated by code P0140.
- Symptoms for OBD code P0140 include: Engine Light ON.
- High Fuel Consumption.
- Excessive Smoke from Exhaust.
Causes of the p0140 OBD Code
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Possible reasons for fault code P0140 include issues with the oxygen sensor circuit.
- Causes: Faulty Rear Heated Oxygen Sensor Bank 1.
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted.
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection.
- Inappropriate fuel pressure.
- Faulty fuel injectors.
- Intake air leaks may be faulty.
- Exhaust gas leaks.
Fixing Error Code p0140 Step By Step
Replace faulty oxygen sensor Bank 1 Sensor 2 to address P0140 fault code.
- To fix OBDII code P0140, first, review the ‘Possible Causes’ mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, test the oxygen sensor (Bank 1 Sensor 2) using a multimeter to verify its functionality.
- If the sensor is faulty, replace it with a new one.
- Clear the fault code using an OBDII scanner and test drive the vehicle to ensure the code does not return.
Cost Of Fixing p0140 Fault Code
Diagnosing and repairing fault code P0140 typically involves testing and replacing the oxygen sensor.
The cost to diagnose and fix OBD code P0140 typically ranges from $75 to $150, based on a 1. 0hour repair time.
Factors like shop rates and the complexity of the repair can influence the final cost.
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Details of the p0140 OBD Code
P0140 indicates an issue with the oxygen sensor circuit for Bank 1 Sensor 2.
OBD code P0140 indicates a fault with the O2 sensor circuit for Bank 1 Sensor 2 in the exhaust system.
This sensor is responsible for monitoring the oxygen levels after the catalytic converter.
The Engine Control Module (ECM) triggers this code when it detects a problem with the signal from the O2 sensor, which could be due to wiring issues, a faulty sensor, or an exhaust leak.
Mechanic’s Tech Notes
Code P0140 indicates an issue with the oxygen sensor circuit for Bank 1 Sensor 2.
To diagnose and fix OBDII code P0140, which indicates an issue with the O2 sensor circuit no activity detected (Bank 1 Sensor 2), start by checking the wiring harness and connectors for any damage or corrosion.
Use a voltmeter to test the O2 sensor’s heater circuit for proper voltage and resistance.
Ensure the sensor is receiving power and ground.
If the wiring and connections are good, the O2 sensor itself may need to be replaced.
A scan tool can be used to monitor the O2 sensor’s activity and confirm proper operation after any repairs are made.
FAQ
OBD code P0140 indicates an issue with the Rear Heated Oxygen Sensor Bank 1. Symptoms include Engine Light ON, High Fuel Consumption, and Excessive Smoke from Exhaust.
Common symptoms for fault code P0140 include Engine Light ON, High Fuel Consumption, Excessive Smoke from Exhaust. Causes may include faulty rear oxygen sensor. Fix: Inspect wiring and connectors.
Diagnose and repair OBD code P0140 by checking the rear heated oxygen sensor Bank 1 and its wiring for faults. Inspect connectors for damage or corrosion.
Wrap Up
If your check engine light is on and you’re experiencing issues with your vehicle’s oxygen sensor, you may see OBDII code P0140. This code typically indicates a problem with the oxygen sensor circuit for Bank 1 Sensor 2 in the exhaust system.
Possible causes include a faulty oxygen sensor, damaged wiring, or a poor electrical connection.
To address OBDII code P0140, start by inspecting the wiring harness and connectors associated with Bank 1 Sensor 2. Check for any signs of damage, corrosion, or loose connections.
If no issues are found with the wiring,
