AutoCodes – Generic – P0140

P0140 Code - O2 Sensor 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 indicates O2 Sensor 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.

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Code Popularity 81,411

How popular is this code, among other codes? Medium

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 12, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P0140 Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0140 - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2 - AutoCodes.com — P0140 Code - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0140?

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?

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.

What does this mean?

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0140 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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Information for Specific Makes

P0140 Audi — HO2S12 Sensor Circuit No Activity Detected
P0140 BMW — O2 Sensor Circuit Low Voltage Bank 1 Sensor 2
P0140 Buick — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Cadillac — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Chevrolet — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Chrysler — O2 Sensor 1/2 Circuit Low
P0140 Dodge — O2 Sensor 1/2 Circuit Low
P0140 GMC — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Hummer — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Hyundai — HO2S Circuit No Activity Detected Bank 1 Sensor 2
P0140 Infiniti — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Isuzu — HO2S Circuit High Voltage Sensor 2
P0140 Jaguar — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Jeep — O2 Sensor 1/2 Circuit Low
P0140 KIA — HO2S12 Circuit No Activity Detected
P0140 Mazda — HO2S Rear Circuit No Activity Detected
P0140 Mercedes-Benz — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 MINI — O2 Sensor Circuit Low Voltage Bank 1 Sensor 2
P0140 Mitsubishi — Cylinder 1-4 Heated Oxygen Rear Sensor No Activity Detected
P0140 Nissan — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Oldsmobile — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Pontiac — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Saturn — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 Subaru — HO2S12 No Activity Detected
P0140 Suzuki — HO2S Circuit Insufficient Activity Bank 1 Sensor 2
P0140 Volkswagen — HO2S12 Sensor Circuit No Activity Detected

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.