How many oxygen sensors does a 2001 Chevy Blazer have?

Number of Oxygen Sensors in a 2001 Chevy Blazer
The 2001 Chevy Blazer has three oxygen sensors. There are two upstream sensors located in the front pipe before the catalytic converter, and one downstream sensor located after the converter.
It’s important to note that the part number for all three sensors is #15562866, and the cost for one sensor is $53.64. It’s advisable to check with your local Chevy dealer’s Parts Department for the exact price and part number.
If you have further questions about the location or replacement of these sensors, feel free to ask for more details.

Contents

Should I replace one or both O2 sensors?
Which O2 sensor is the main one?
Can you replace just the upstream O2 sensor?
How can you tell which O2 sensor is bad?
Should I replace all 4 O2 sensors at once?
Do you have to replace both O2 sensors at the same time?
Which O2 sensor usually goes bad first?
Will an O2 sensor work without a catalytic converter?
How many O2 sensors does a V6 have?
How many O2 sensors are in a 2001 Chevy Blazer?

Should I replace one or both O2 sensors?

Manufacturers recommend replacing O2 sensors in pairs (both Upstream or both Downstream). An older, slower sensor can cause an imbalance in the engine management system, leading to poor fuel economy and possible damage to the catalytic converter.

Which O2 sensor is the main one?

Sensor 1 is the upstream oxygen sensor. It is the sensor that measures the oxygen content in the exhaust, providing an input to the computer, which determines how to adjust the air/fuel ratio. Sensor 1 is the sensor closest to the engine. Sensor 2 is the downstream oxygen sensor.

Can you replace just the upstream O2 sensor?

How can you tell which O2 sensor is bad?

Performance by monitoring fuel air mixture. And catalytic converters. When they start to fail your fuel economy and emissions can be affected. It’s likely you’ll see a check engine.

Should I replace all 4 O2 sensors at once?

Do I need to replace all of the sensors at once? It is best to replace O2 sensors in pairs. For example, if you replace the downstream left sensor, you should also replace the downstream right.

Do you have to replace both O2 sensors at the same time?

Manufacturers recommend replacing O2 sensors in pairs (both Upstream or both Downstream).

Which O2 sensor usually goes bad first?

bank 1 sensor 2 is usually the first to go. just replaced one on a 98. the part is 99 bucks, I paid someone 40 for the install. But yes, you should replace both the upstream O2 sensors at the same time.

Will an O2 sensor work without a catalytic converter?

Will an O2 sensor work without a catalytic converter? Yes they do work with or without a converter present. Oxygen sensors do just that: they measure the amount of oxygen present in the exhaust gasses.

How many O2 sensors does a V6 have?

Modern vehicles with V-6 or V-8 engines could have as many as four O2 sensors — one located in each cylinder bank and one after each catalytic converter. If either the oxygen sensor in the cylinder block or the one for the catalytic converter fails, your vehicle could experience serious engine problems.