P0140 Mitsubishi Code - Cylinder 1-4 Heated Oxygen Rear Sensor No Activity Detected
Quick Answer
The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include 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. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0140 Mitsubishi indicates Cylinder 1-4 Heated Oxygen Rear Sensor No Activity Detected.
- Common causes
- Common causes include 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.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0140 Mitsubishi Description
What are the Possible Causes of the DTC P0140 Mitsubishi?
- 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
How to Fix the DTC P0140 Mitsubishi?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0140 Mitsubishi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0140 Mitsubishi Code
1. What are the common symptoms of OBDII code P0140 in a Mitsubishi?
- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.
2. What does the OBDII code P0140 in a Mitsubishi indicate?
- The code P0140 indicates that the Engine Control Module (ECM) has detected no activity from the rear oxygen sensor in cylinder 1-4.
3. What are some possible causes of OBDII code P0140 in a Mitsubishi?
- Possible causes include a faulty rear oxygen sensor, wiring issues, a damaged sensor connector, or an ECM malfunction.
4. How can I diagnose the cause of OBDII code P0140 in my Mitsubishi?
- You can use a multimeter to test the rear oxygen sensor for proper voltage output, inspect the wiring for any damage, and check the sensor connector for corrosion or loose connections.
5. Is it safe to continue driving with OBDII code P0140 in a Mitsubishi?
- It is generally not recommended to drive with this code present, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.
6. Can I repair OBDII code P0140 in my Mitsubishi myself?
- Depending on the cause, you may be able to replace the rear oxygen sensor yourself. However, if the issue lies with the wiring or ECM, it is recommended to seek professional assistance.
7. What are some tips for preventing OBDII code P0140 from appearing in my Mitsubishi?
- Regularly inspect and maintain your vehicle's oxygen sensors, ensure proper wiring connections, and promptly address any check engine light warnings.
8. Does OBDII code P0140 affect the performance of a Mitsubishi vehicle?
- Yes, this code can affect the performance of the vehicle by causing issues such as decreased fuel efficiency, rough idling, and potential engine misfires.
9. How much does it typically cost to repair OBDII code P0140 in a Mitsubishi at a repair shop?
- The cost of repairing this code can vary depending on the cause, but it may range from $100 to $300 for parts and labor.
10. Can resetting the OBDII code P0140 in a Mitsubishi temporarily solve the issue?
- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed, the code is likely to reappear.
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