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Oxygen Sensor
When you start looking at the O2 sensors, they are normally numbered something like "Bank 1 Sensor 1" Bank 1 is on the passenger side - or closest to the firewall; Bank 2 is on the driver's side - the front bank.
Sensor 1 is the upstream sensor (near the frame, between the block and the cat) and Sensor 2 is near the Y-pipe (downstream of the cat).
Normally it is the upstream sensors (sensor 1) that go first. They see the harshest conditions.
You will need;
Oxygen Sensor Socket
Anti-Seized
Penetrating Oil
Sometimes it will take 15 minutes or take a few hours it depends on your luck…
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∙ 14y ago
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You need to change the downstream sensor that is after the Catalytic Converter
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