Question about 2003 Chevrolet Impala

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O2 scensor for 03 impala

Need front o2 scensor for 03 impala 3.4. are they a easy fix?

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Yes, they are a very easy fix. The only "heads up" would be to make sure you soak the threads very, very well before removing. Since the exhaust goes through extreme heat/cool cycles, the can sometimes be a bugger to get out. If you use a product like PB Blaster and thoroughly soak the threads a few times (or squirt it a few times an hour apart before going to bed, then do it again when you get up), it should make it easier.

Basically it just screws in. There is a built in hex on the end that you can put a wench on to unscrew it. The wire harness/connector (4 wire for your car) is just a standard female plug. Unplug the wire connector, unscrew the old sensor, screw in the new one & plug the connector back together. If your check engine light is on, you'll need to clear the code afterwards. Any auto parts store (O'Reilly, NAPA, etc.) can do this for free. Hope this helps!

Here's a pic of your O2 sensor:

o2 scensor for 03 impala - da835c9.jpg

Posted on Feb 03, 2010

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Yes. just disconnect the small harness. unscrew the old one screw the new one on torque to 15FT LBS and reconnect the harness, and your done.

Posted on Feb 03, 2010

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