Question about 2004 Honda Accord
On four cylinder models, the upstream oxygen sensor is located at the upper end of the catalyst pipe, right below the exhaust manifold flange (the downstream is located on the catalytic converter itself).
On four cylinder models, the electrical connector for the upstream oxygen sensor (the one before the catalytic converter) is behind the cylinder head, just to the left of the rear engine mount bracket (or you could find the sensor and simply follow the wire). Depress the release tab and and disconnect it.
Raise the vehicle.
Unscrew the sensor (since it has a wire coming from it, and a shield around the place where it goes in, you would be advised to rent a sensor removal wrench from Autozone or one of the same sort).
Autozone also carries the sensors. They are pretty expensive, something like $60.00, I think.
Hope this is helpful to you.
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
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