Question about 2003 Chevrolet Silverado 1500

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Hi, i have an 03 silverado with the 4.8 in it my check engine light came on today what could that be? o2 censor?

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It could be an O2 sensor or any condition that would set a Diagnostic Trouble Code (DTC). You need to borrow a scanner in order to find what code(s), if any, are being set. You would be looking for something like P0131 which would be HO2S Circuit - Low Voltage - Bank 1, Sensor 1. If you run through 3 consecutive starts and the code clears, it will turn off the Malfunction Indicator Lamp (MIL), and it should be okay. If not, you may need diagnostic help.

Posted on Oct 07, 2010

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Hello, and welcome. it could be a 02 sensor, but you will need to have the system scanned for trouble codes to know what the root cause is. once the trouble code has been pulled, then we would have a much better idea what the fault is

Posted on Oct 07, 2010

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The role of the #2 O2 sensor is to make sure not only that the #1 sensor is actually doing its job of maintaining a 14.7:1 air/fuel ratio governed by the computer, but it's also making sure that the catalytic converter is not only present, but also that it's doing its job as well.

This isn't a very expensive part, it's easy to find, and will require an O2 sensor socket to do the job. Make sure you don't use any grease on the new sensor! It can actually render it unusable and cause your check engine light to come on again.

That reminds me...When you change out your #2 O2 sensor, in order to turn off the Check Engine light, you'll need to take it somewhere such as an auto parts store like Advance Auto Parts, who have a scanner to connect to your car's computer and clear the fault code. Otherwise, your computer will have to count a certain amount of ignition cycles before it determines that all is well with your emissions system.

Good luck, have fun, and I hope this helps! :)

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