What Happens If You Don’t Replace Oxygen Sensor?
Neglecting to replace a failing oxygen sensor can lead to significant consequences. If you are wondering whether you can run with a bad oxygen sensor this is an article you should not miss. So, what happens if you don’t replace oxygen sensor? We will be covering every aspect of this. Let’s go!
When to Replace an O2 Sensor?
Oxygen sensors typically need replacement based on several indicators, such as
- If the CEL is illuminated and diagnostic trouble codes (DTCs) indicate an O2 sensor issue, it’s time for a replacement.
- Noticeably reduced gas mileage could signal a failing O2 sensor, affecting fuel mixture and efficiency.
- Rough idling, engine hesitation, or misfires may indicate a faulty O2 sensor affecting engine timing and combustion efficiency.
- Follow vehicle manufacturer guidelines, generally suggesting replacement every 60,000 to 100,000 miles, though this can vary.
How Long Does an Oxygen Sensor Last?
What Happens If You Don’t Replace Oxygen Sensor?
Neglecting to replace a faulty oxygen sensor can lead to several significant consequences for your vehicle’s performance, emissions compliance, and overall longevity.
Decreased Fuel Efficiency
A failing oxygen sensor can disrupt the air-fuel mixture, causing the engine to burn more fuel than necessary. This inefficiency results in decreased miles per gallon (MPG) and increased fuel costs over time.
Engine Performance Issues
A faulty oxygen sensor can cause rough idling, engine hesitation, or even engine misfires. It affects the engine’s ability to adjust fuel delivery based on oxygen levels, leading to compromised performance and drivability.
Increased Emissions
Oxygen sensors play a critical role in monitoring and regulating emissions. A malfunctioning sensor may inaccurately measure oxygen levels, resulting in higher emissions of harmful pollutants like carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC).
This not only contributes to environmental pollution but can also lead to vehicle inspection failures in areas with emissions standards.
Damage to Catalytic Converter
Oxygen sensors help protect the catalytic converter by ensuring the proper air-fuel mixture. Without functioning sensors, the converter can be damaged over time due to excessive unburned fuel reaching it, leading to costly repairs or replacement.
Reduced Engine Longevity
Prolonged operation with a faulty oxygen sensor can strain other engine components, potentially leading to more extensive and expensive repairs over time. This includes damage to spark plugs, the exhaust system, and even the engine itself.
Safety Risks
In extreme cases, a malfunctioning oxygen sensor can cause engine overheating or other issues that compromise vehicle safety and reliability.
How Long Can You Go Without Replacing an O2 Sensor?
The duration you can go without replacing an oxygen (O2) sensor depends on several factors, including the severity of the sensor’s malfunction and its impact on vehicle performance. Here is a detailed explanation.
If the oxygen sensor is completely failed or sending inaccurate readings, it can lead to immediate issues like reduced fuel efficiency, poor engine performance, and increased emissions. In such cases, prompt replacement is recommended to avoid further damage and maintain vehicle operation.
Many modern vehicles are equipped with onboard diagnostics that trigger a check engine light (CEL) when a sensor malfunctions. Ignoring a persistent CEL related to the oxygen sensor can lead to prolonged inefficiencies and potential damage to other engine components.
In regions with emissions testing requirements, a malfunctioning oxygen sensor can cause the vehicle to fail inspections. This may result in fines or restrictions on vehicle use until the issue is resolved.
Continued operation with a faulty oxygen sensor can lead to increased wear on the engine and potentially expensive repairs, such as damage to the catalytic converter or other emissions control systems.
How Much Does it Cost to Replace an Oxygen Sensor?
The cost to replace an oxygen sensor can vary based on several factors, including the vehicle make and model, the type of sensor needed, and where you get the replacement done (DIY vs. professional mechanic). Here are some general cost estimates:
The price of an oxygen sensor typically ranges from $20 to $200 or more, depending on the quality and brand. Some vehicles have multiple sensors, so costs can vary based on how many need replacement.
If you hire a mechanic to replace the sensor, labor costs can range from $50 to $200 or more per hour, depending on the mechanic’s rates and the complexity of the job.
On average, replacing a single oxygen sensor can cost between $100 and $400. The cost can be higher for luxury vehicles or those with hard-to-reach sensors.
I’m Alex, a seasoned mechanical teacher with over 20 years of hands-on experience in Australia. My passion for all things automotive has driven me to establish this blog, aiming to share my wealth of knowledge and expertise with fellow enthusiasts, DIYers, and anyone keen on understanding the mechanics behind the machines we rely on daily.
