P0146 Code - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3
Quick Answer
The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 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
- P0146 indicates O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 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 P0146 Description
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.
What are the Possible Causes of the DTC P0146?
- Faulty Heated Oxygen Sensor Bank 1 Sensor 3
- Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection
How to Fix the DTC P0146?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0146 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
- P0146 Buick — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3
- P0146 Cadillac — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3
- P0146 Chevrolet — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3
- P0146 GMC — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3
- P0146 Infiniti — Heated Oxygen Sensor 3 Circuit No Activity Detected
- P0146 Mercedes-Benz — O2 Sensor Circuit No Activity Detected Bank 1 Sensor 3
- P0146 Mitsubishi — Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 3
- P0146 Nissan — Heated Oxygen Sensor 3 Circuit No Activity Detected
- P0146 Volkswagen — O2 Sensor Circuit No Circuit Activity Detected Bank 1 Sensor 3
Frequently Asked Questions about P0146 Code
1. What are the common symptoms of OBDII code P0146?
- Common symptoms include poor fuel economy, rough idling, stalling, and a noticeable decrease in engine performance.
2. What does the OBDII code P0146 indicate?
- OBDII code P0146 indicates that there is no activity detected from the oxygen sensor (Bank 1 Sensor 3) in the exhaust system.
3. What are the possible causes of OBDII code P0146?
- Possible causes include a faulty oxygen sensor, wiring issues in the sensor circuit, exhaust leaks, or a problem with the engine's computer system.
4. How can I diagnose the O2 sensor circuit for Bank 1 Sensor 3?
- Diagnosing the O2 sensor circuit involves checking the sensor's wiring for continuity, inspecting for any visible damage, and using a multimeter to test voltage and resistance.
5. Can I drive my vehicle with OBDII code P0146?
- It is not recommended to drive your vehicle with OBDII code P0146, as it can lead to further damage to the engine and emission control system.
6. What is the typical repair for OBDII code P0146?
- The typical repair involves replacing the oxygen sensor (Bank 1 Sensor 3) with a new, high-quality sensor and ensuring all wiring connections are secure.
7. How important is it to address OBDII code P0146 promptly?
- It is important to address OBDII code P0146 promptly to maintain optimal engine performance, ensure fuel efficiency, and prevent potential damage to the catalytic converter.
8. Are there any DIY repair tips for fixing OBDII code P0146?
- While some drivers may attempt to replace the oxygen sensor themselves, it is recommended to consult with a professional mechanic for accurate diagnosis and repair.
9. Can a faulty oxygen sensor cause other issues besides triggering OBDII code P0146?
- Yes, a faulty oxygen sensor can lead to a variety of issues, including poor engine performance, increased emissions, and potential damage to the catalytic converter.
10. How can I prevent OBDII code P0146 from recurring in the future?
- Regular maintenance, such as replacing oxygen sensors at recommended intervals, inspecting wiring for damage, and addressing any engine performance issues promptly, can help prevent OBDII code P0146 from recurring.
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