P0140 Hyundai Code - HO2S Circuit No Activity Detected Bank 1 Sensor 2
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 Hyundai indicates HO2S Circuit No Activity Detected Bank 1 Sensor 2.
- 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 Hyundai Description
What are the Possible Causes of the DTC P0140 Hyundai?
- 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 Hyundai?
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 Hyundai 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.
Need more information about the P0140 Hyundai code?
Need more information on how to fix the P0140 Hyundai code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0140 Hyundai code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0140 Hyundai Code
What does the OBDII code P0140 mean on a Hyundai?
P0140 on a Hyundai indicates that the downstream oxygen sensor (Bank 1, Sensor 2) is not detecting any activity or voltage changes, which could mean the sensor is faulty or there’s an issue in the circuit.
What are the symptoms of code P0140 in a Hyundai?
Symptoms may include no noticeable drivability issues, poor fuel efficiency, a persistent check engine light, and possibly failed emissions testing.
What causes the P0140 code on a Hyundai?
Common causes include a faulty oxygen sensor, damaged wiring or connectors, an exhaust leak, or issues with the engine control module (ECM).
How do I diagnose the P0140 code on a Hyundai?
Start by checking the wiring and connectors for damage, inspect the oxygen sensor for proper function, and use a scan tool to monitor live data from the sensor.
Can I drive my Hyundai with the P0140 code active?
Yes, you can usually drive with this code, but it’s not recommended as it may lead to poor fuel economy and potential long-term damage to the catalytic converter.
How do I fix the P0140 code on my Hyundai?
Fixes may include replacing the downstream oxygen sensor, repairing damaged wiring, addressing any exhaust leaks, or reprogramming the ECM if needed.
How much does it cost to repair the P0140 code on a Hyundai?
The cost can vary, but replacing an oxygen sensor typically ranges from $150 to $350, including parts and labor. Wiring repairs or ECM reprogramming may cost more.
What tools do I need to fix the P0140 code on a Hyundai?
You’ll need a scan tool to read live data, a multimeter to test wiring, and basic tools like a socket wrench and oxygen sensor socket for replacement.
Can an exhaust leak cause the P0140 code on a Hyundai?
Yes, an exhaust leak near the oxygen sensor can disrupt sensor readings and cause the P0140 code to appear.
How can I prevent the P0140 code from recurring on my Hyundai?
Regular maintenance, inspecting sensors and wiring, and addressing exhaust leaks promptly can help prevent this code from returning.
Discuss the causes and fixes for P0140 Hyundai OBDII Code
Code P0140 Hyundai comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
