How many O2 sensors does a Honda CRV have?

A Honda CR-V typically has two oxygen (O2) sensors. These sensors are crucial components in the vehicle's emissions control system, responsible for monitoring the air-fuel ratio and ensuring efficient combustion.

Understanding O2 Sensors in a Honda CR-V

The Honda CR-V, like most modern vehicles, is equipped with multiple O2 sensors to optimize engine performance and reduce harmful emissions. These sensors are strategically placed in the exhaust system to continuously measure the oxygen content in the exhaust gases.

• Upstream O2 Sensor: Located before the catalytic converter, this sensor monitors the air-fuel ratio entering the converter and provides feedback to the engine control unit (ECU) to adjust the fuel mixture accordingly.


• Downstream O2 Sensor: Positioned after the catalytic converter, this sensor checks the efficiency of the converter by measuring the oxygen content in the exhaust gases leaving the vehicle.

By using the data from these two O2 sensors, the ECU can make real-time adjustments to the fuel injection system, ensuring the engine operates at the optimal air-fuel ratio. This helps to maximize fuel efficiency, reduce emissions, and maintain the overall performance of the Honda CR-V.

Importance of Properly Functioning O2 Sensors

The O2 sensors in a Honda CR-V play a critical role in the vehicle's emissions control system. If one or both of the sensors fail, it can lead to a range of issues, including:

• Decreased fuel efficiency


• Increased emissions and potential failure to pass emissions tests


• Reduced engine performance and power


• Triggering of the check engine light and diagnostic trouble codes

Regular maintenance and timely replacement of the O2 sensors, as recommended by the manufacturer, are essential to ensure the Honda CR-V's emissions system operates at peak efficiency and compliance with environmental regulations.

How many O2 sensors does a Honda CR-V have?

Therefore, the CR-V has two primary O2 sensors: Upstream O2 Sensor (Bank 1 Sensor 1): This sensor is located before the catalytic converter.

Should I replace all four O2 sensors at once?

No, you should not replace all four oxygen sensors at once unless a specific diagnostic indicates they are all failing. It's more cost-effective to replace only the sensors that have failed, as they do not wear out at the same rate. It is often recommended to replace them in pairs (e.g., both upstream or both downstream) if one fails, as the remaining sensor is likely in a similar condition and may fail soon, Reddit user. 
This video explains the importance of replacing O2 sensors in pairs: 57sMatt's ShopYouTube · Aug 9, 2017
When to replace all at once

• If your vehicle's computer reports all four sensors are failing simultaneously, as this may indicate a wiring issue rather than four individual sensor failures, Reddit user. 
• If the car has a history of issues that could foul all sensors, such as a prolonged engine running rich condition. 

When to replace in pairs

• If one sensor fails, replace it along with its counterpart on the same bank (e.g., both upstream or both downstream). 

When to replace just one

• If you only have a fault code for a single sensor, replace just that one and monitor the situation. 

You can watch this video to learn how to test O2 sensors: 44sEasyAutoFixYouTube · Sep 18, 2022
Other considerations

• Upstream vs. downstream: Upstream sensors are crucial for engine operation, while downstream sensors primarily monitor catalytic converter efficiency. 
• Preventative maintenance: Replacing sensors is not recommended as routine preventative maintenance because they do not all wear out at the same time. 
• Diagnosis is key: Always diagnose the specific sensor that is failing before replacing it, and if multiple sensors are failing, first investigate potential underlying issues that could have caused them to fail. 

How much to replace an oxygen sensor on a Honda CRV?

The average cost for a Honda CR-V Oxygen Sensor Replacement is between $582 and $707. Labor costs are estimated between $49 and $72 while parts are priced between $533 and $635. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.

What is the most common problem with Honda CR-V?

The most common problem with the Honda CR-V is air conditioning system failures, particularly compressor issues that can occur between 40,000 and 100,000 miles, according to this YouTube video. Other frequent problems include engine issues like oil consumption and fuel leaks (especially in the 2011-2012 model years), and electrical glitches such as faulty door actuators or alternator problems. For newer models, some owners report problems with the fuel injectors that can cause safety feature malfunctions, while others have experienced issues with the power steering. 
Common problems by system 
This video explains the common problems with the Honda CR-V, including AC failures, oil consumption, and steering issues: 1mCarnivautoYouTube · Feb 1, 2025

• Air Conditioning: Frequent failures, sometimes referred to as "Honda Black Death," especially in models from 2002-2009. This is often due to compressor failure. 
• Engine: Excessive oil consumption has been reported, particularly in the 2011 model year. Fuel can also leak into the engine oil, leading to engine damage. 
• Electrical:
  • Alternator problems: In some models, the alternator can fluctuate in voltage, causing various issues. 
  • Door actuators: Randomly locking and unlocking doors can occur, and in rare cases, the locks may jam. 
• Safety/Driving:
  • Steering: Some models have issues with "sticking" steering or defective electronic power steering (EPS) racks. 
  • Automatic Emergency Braking: On certain models, the system has been known to activate unexpectedly. 
  • Fuel injectors: On some models, faulty fuel injectors have been linked to failures in safety features like adaptive cruise control and lane keep assist. 
• Other:
  • Transmission: Some models have reported issues with rough shifting or premature transmission failure. 
  • Brakes: Warped front brake rotors causing vibration when braking have been reported. 
  • Wiper Motor: Failure of the windshield wiper motor can cause the wipers to not park properly. 

Which model years are affected?

• 2002–2009: Noted for AC "Black Death" failures.
• 2011: Known for excessive oil consumption.
• 2017–2019: Reports of safety system malfunctions and steering issues.
• 2019: Specific problems with fuel injectors and the emergency braking system.
• 2022: Recalls and issues with the alarm system and keyless entry.