2004 Chevy Cavalier o2 sensor

2004 CHEVROLET CAVALIER
73,000 MILES • 4 CYL • FWD • AUTOMATIC
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DCHUCHRAN
  • MEMBER
  • 1 POST
My O2 sensor went on my car, and it costs alot of money to buy it at an auto parts store, so I can only imagine taking it to a shop. A guy that worked at a store showed me where it is, and it looks like I can replace it myself from under the hood. I have looked everywhere online, and have not been able to find anything on how to replace it. I am really hoping that I can either get a diagram from you, or maybe some advice on how to replace it myself. I am supposed to be driving back to Michigan from Arizona on Sept 30th. so I really need to get this taken care of as soon as possible. I would really appreciate any help I can get. Thank you so much.
Sep 26, 2008 at 3:54 PM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
Spray the threaded sensor area with PB Blaster (cold engine). Disconnect electrical connector, use large socket or wrench to remove.

This car is equipped with two sensors, upstream and downsteam. You would have to get under car to get to the downstream (located after CAT).

When installing ALWAYS use an antisieze compound on the sensor threads. Some sensors come with it already coated on the threads or a small packet.
Sep 27, 2008 at 12:49 AM
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